O2 Mark - realistic dildo by Tantus - review by HannahPanda

O2 Mark

Realistic dildo by

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O2 Marks the Spot

Mark is that perfect in-between dildo that isn't too much of any one thing. Whether it's size, curvature, realism or texture, Mark is average in all departments and is one of the most realistic feeling dildos I own. Its dual-density core would pass just any squeeze test, and the quality just speaks for itself. This dildo pleases both aesthetically and during use and shows that average looks can be very deceiving.
Firm core, Anal safe, Quality silicone, Easy to sterilize, Harness compatible, Fairly realistic
Base is a bit too wide, Lint magnet
Rating by reviewer:
extremely useful review


This fleshy, harness compatible dildo is perfect for those searching to add perfectly sculpted silicone into their play. Tantus makes the O2 with a firm inner core, but the outside is made of a softer, pliable silicone to make this cock feel 100% the real deal. However, it isn't the most realistic looking model, and therefore is perfect for those of you who don't want something that looks like it has a pulse. This model only gets better as your eyes travel down the scattered veins along the shaft and meet the base. A wide base means that you not only can slip this into your harness, but it's compatible for using anally. Mark isn't exactly designed to meet those of you size queens/kings' needs, but it's a great, average sized cock that is friendly for beginners and advanced users.
  • Who / How / What
    [ ? ]
    Who might this product be best for? How is it best used? What are the best circumstances or situations for using this product?
    • Everyone
    • Gender play
    • Solo
  • Where
    [ ? ]
    Where / what types of places can this product be used?
    • Anywhere
    • Campus/roommate living
    • Tub/shower/pool
  • Features
    [ ? ]
    What kind of features does this product offer?
    • Travel friendly
  • Body / part areas
    [ ? ]
    What areas on the body can this product be used / what areas does it stimulate best?
    • Anal

Material / Texture

Tantus advertises the Mark to be one of their softest models, and I wasn't entirely let down when I received it and gave it a squeeze test. It's made of 100% Ultra-Premium Platinum silicone, and it lives up to such a prestigious name. It's certainly very soft silicone and feels velvety to the touch. I'm a fan of Tantus's silicone and have always felt it's one of the best. I admit, I thought it'd be a bit softer, but my taste in soft toys comes close to nearly limp, oddly enough. There are two textures to note on the toy, one being the base and shaft, which are matte silicone, and the head, which is a slick silicone and smoother than the rest. The head is a little softer than the rest of the toy and has a bit of give when you press your fingers into it. When inserting, this is really useful for me, because the give of the head makes it a lot more comfortable if I'm extra tight or feeling sore that particular day. The way the entire toy feels as a whole is due to the dual density property this dildo has. Tantus incorporated a firmer, inner core in the center and surrounded it with a softer silicone to make it feel like a realistic cock. Next to my Vixskin models, this feels the most realistic in my collection. I'm definitely a fan of the black color I purchased it in. It's always great when a company offers a color like black, as it pulls away from the realism a bit and makes the toy a lot more fun to me. My partner absolutely loves my color choice, as this is the first black toy I've purchased, and it looks great in any harness I pair it with.

I find that the matte nature of the silicone makes the toy have a bit of drag, so I always use lube when using Mark. Water-based lubes are best, as they won't damage the silicone, and generally can be re-applied generously without getting gunky and overbearing. You can also warm up the silicone by placing it in or under hot water for 6-7 minutes. It'll heat up quite nicely, and is the cock equivalent of having hot towels from the dryer.

*This silicone is an absolute lint whore! It clings to each and every particle it comes across.
    • Harness compatible
    • No odor
    • Not porous at all

Design / Shape / Size

Size queens need not apply. Marks 6 1/2" long base, 5 1/2" insertable, just isn't going to do it for someone who needs a little more in the length department. It's a good, average size, which is why I ordered it and completely adored the size all around. I'm a retired size queen and my vagina decided to be a little more realistic and ever since, dildos close to the size of Mark have just done it for me. If you like or love the Vixskin Goodfella, Mark is a fantastic option. With a circumference of 4 3/4", it's also not a heap of a lot of size width wise. I find that I don't feel entirely full with Mark inside of me, but I feel full enough, and that's fine by me. It's kind of like when you're out for an evening meal and you're so tempted to take those last few bites, but you don't want to feel grossly overfull so you're satisfied not feeling like a balloon for the night. Mark would be a good warm up toy for those who like their stretches before a good cock work out, and I tend to use him a little bit for that, myself. Light veins run along the shaft to give the smallest hint of texture without overdoing it. I like the veins, but they aren't as noticeable visually on the black coloring of my Mark. They're very subtle and can't be felt much when inserted, but really tie the look and feel of the Mark together well.

The design doesn't include an extreme G-spot curve, which my partner tends to work her hips in a way that makes that not make much of a difference. I think Mark could've used a slightly more intense degree of a curve, but Tantus was going for more subtlety with Mark. He does have a bit of a curve that is just enough for me to get where I need to go. It's also fairly flexible but nearly impossible to bend all the way back onto itself. It's got just enough give to move inside of me comfortably without feeling like a rock lodged into my canal. I hate when toys seem to just ram into my cervix and it happens easier than I'd like to admit. My vaginal canal is short and toys like Mark tend to give my cervix soft kisses, rather than giving way too much length and penetration which winds up making me feel more violated than pleased. The head is detailed and ridged, which would be great for G-spot stimulation, but it could stand to be just a bit firmer. I'm okay with the head being so soft for insertion, but as for my G-spot, it could use a good massage versus a light rub. It isn't all together too soft, so once again, it's just another in-between quality that makes Mark so.. Mark.

Overall, it's a great cock for beginners and those who don't need a lot of anything other than quality from a dildo. It's not at all discreet, as most dildos aren't, and should probably be stored away from toys of other materials and places where it could collect lint and dust.

    • Partner play
    • Realistic


Mark and some harnesses just don't get along. The base, with a diameter of 2 5/8", is a little difficult to get into my built-in O-rings of my Sasha Harness and my Tomboi harness. You're going to need a fairly large O-ring to accommodate the wide base that makes this toy so perfect for anal use. It doesn't look like it's going to fit at first, but your best bet is to slide one side in first, and then pull the O-ring around it completely and it'll pop in just fine. As for coming out, it's really difficult and I get my daily arm workout from pulling it out. Other than that, it's a great dildo and one of my favorites in my collection. It doesn't leave me sore or stretched out, which means my partner looks forward to me being able to take bigger things after we use the Mark. The black color that Tantus offered only adds that much more to my love of this dildo, as black is kind of a harsh color and my partner can really pound into me when using this, since the size and texture aren't at all extreme.

    • Easy to use
    • Not discreet at all

Care and Maintenance

Silicone is the safest and easiest material to take care of. It isn't at all porous, so you don't run the risk of awful bacteria hanging around on or inside it. You can boil Mark, sit him along side your dishes in the dish washer or sink, take him in the shower and bath, or simply use an antibacterial soap and warm water to cleanse and sanitize. You can also use a toy cleaner and/or wipes, if you'd like. Any method is awesome and will keep your dildo clean and ready for use. I keep toy wipes handy when I'm using Mark, as the lint he picks up kind of gets out of control quickly between uses.

When it comes to lubing your buddy up, avoid using any silicone-based lubes, which have a high risk for damaging the silicone material of the toy by melting it. Water based lubes are best to use with silicone toys and is 100% safe to use with the material. I don't use the original packing to store it, but rather a plain Ziploc bag, as I find that this keeps the lint and dust particles off the surface best.

Tantus describes on their packaging that their products are "hypoallergenic, hygienic, phthalate free, odorless, tasteless, boilable, bleachable, and completeley non-toxic." If that's not a safety guarantee, then I don't know what is!

I've included a photo of just how much the Mark adores picking up lint:

    • Easy to clean
    • Easy to store


The packaging is pretty informative and there's a little something to read on every side. There's a lot of information on the quality of the silicone and why Tantus is a great choice for toys. It's a plastic casing that is easy to open and folds flat when you're ready to discard it. It's completely see through, though, so this packaging can't be considered discreet in the very least. Inside, the dildo comes in a clam-shell like plastic casing that has a mold of the toy to hold it into place. It isn't ideal for great storage because it's a bit of a hassle to transfer it back and forth out of the box into that casing, so most toy pouches or bags would be better if you don't mind the little bit of lint they might pick up from them. I wish Tantus used the same plastic cylinders with plastic lids on each side for the bigger dildo models, but sadly, they're for smaller sized dildos.

    • Not discreet
    • Very informative

Personal comments

I find that the O2 Mark isn't nearly as soft or squishy as any of my Vixskin models, but I enjoy it for the fact that it's a little less realistic and brings a little something different to the table as far as realistic dildos go. I think the size parallels the Goodfella closely, with obvious design differences, and I love them both for different reasons. The Goodfella has a bit more texture to it, is 100% realistic, and the Mark has a soft subtlety about it that just makes it nice and understated. Both models weigh about the same, though I prefer the Goodfella on most days and I bought my Mark mainly for the color and average size. My partner absolutely loves using it for these reasons, as well.

I've included pictures of how the Mark looks in my Sasha harness:

Follow-up commentary
I still adore this color, material, and shape. It's worked time and time again in the bedroom and it's the perfect size for my body type. I still love that it's realistic, but does not dive into the "ultra-realistic" pool. It's harness compatible, and the just flexible enough base makes it both easy to use and great for couples.
This product was provided at a discounted price in exchange for an unbiased review. This review is in compliance with the FTC guidelines.
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  • misterazor
    you look serious with that thing! good review
  • Arlinnae
    Thanks for the pics!
  • Modern^Spank^Anthem
    great review
  • roskat
    Quite the lint magnet indeed!
  • Real or memorex
    Thanks for the great review.
  • Zandrock
    Great review
  • Septimus
    Great review, thanks for sharing!
  • Andrey2052
  • karenm
    Great review, thanks!
  • Mr. John
    Great review.
  • eri86
    Thanks for taking the time to write and share your review.
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