I purchased my harness for girl-on-girl action and pegging. It does a wonderful job at both. Since the o-ring is stretchy, it can handle a smaller dildo or decently larger ones.

I've had poorer quality harnesses before I bought my Theo, and honestly, the others weren't even worth my time. You don't have to be an expert to use the Theo. I wouldn't even bother with lesser harnesses. Just go ahead and invest in a Spareparts harness.

The Theo shows a female model on the box, but because of the split pouch where the O-ring is, I am sure a man can use it. (I will try this and report back in my follow up.)

Theo is waterproof, so water fun is a MUST with the Theo. It's made of Nylon and Spandex (like a swim suit).

The Theo is made of Nylon and Spandex. It feels soft and silky to the touch and has no noticeable smell to it. The bag it comes with is made of the same material. There is a Spareparts logo on the front. It is screened on instead of stitched on, and it is flat, so it doesn't really add or take away from the harness.

My Theo is the Pearl edition. It has little pearly-white colored buttons on it. They are smooth, hard, and round. Because of their location, the wearer cannot feel them. The receiver could potentially feel the one pearl button on the bottom front of the pouch, depending on the position, but it is so small and smooth, it wouldn't be a hindrance.

The adjusting mechanisms on the hips are Velcro, but the straps are wide enough so you don't ever feel it. In addition to the Velcro, there are pull straps to secure the Velcro. The mechanism on the pull straps is hard, smooth plastic. The adjusting mechanisms on the thong portion are snaps. The snaps are surrounded in thick (but not too thick) padding.

The Theo is a very well made thong-style harness. It is very adjustable. The hip straps are wide and adjust via Velcro. The Velcro is very strong and doesn't come undone easily, but if this wasn't good enough, it has adjustable pull straps over-top the Velcro straps that are secured with a easily adjustable, hard plastic device. The thong piece is thick but not uncomfortably so. It is thick enough so the metal snaps don't hurt or push into you in a way that is uncomfortable. The metal snaps are a little bit of a pain but not so much that it isn't worth it. They are alternating male and female on the top row and bottom row so they can be adjusted from really big to really small.

The Theo's size is completely versatile. I have a Size B. Size B says it is recommended for waist sizes of 35-65 inches, but I did some messing around, and it could easily fit someone waaay smaller (approximately 20 inches). The smaller size is recommended for 20 to 50 inch waist lines.

The dildo slips through a sturdy elastic O-ring. It can accommodate my Frederick dildo with ease, and doesn't stretch out (providing you remove the toy after use). It also works well with smaller dildos such as this one. The pouch is split in the back so double ended dildo use is possible too!

Also a nifty little fact about the Theo: it has a small pocket above and below the O-ring for microvibes and is a PERFECT fit for the We-Vibe Tango or Salsa. Since there are two of them, you and your partner both get awesome stimulation.

I've found that the Theo can be worn underneath clothing if if properly fitted to the body.

The size of the Theo was phenomenal. I honestly expected it not to fit me; I have a weird shape, but it did fit! It also fit my friend with ease. Because of the adjust-ability of the harness it is a good fit for anyone. The wide straps and soft thong style are very comfortable - even after extended use.

The spandex and nylon in the waistband allow for it to fit you snugly - but not cut off circulation.

The Theo provided me with unsurpassed control over my dildo. It felt more like an extension of me rather than a strap on. It was easy to glide in and out, and the movements were not unnatural feeling or awkward. I was honestly surprised at the amount of comfort the Theo had in relation to control. With other harnesses, I've noticed that if I want more control, the harness would lack comfort and vice-versa, but that is not the case here. I was able to maintain superior control over the harness - HANDS FREE - in any position I threw at it, it was extremely comfortable.

Putting it on and adjusting the waist is easy: just Velcro the straps down, pull on the pull straps and you're good to go with that part. The thong part is a little more aggravating, so I suggest finding the right fit and keeping it there. The reason it's aggravating is because there are so many snaps!

Toys are easily slipped into the stretchy o-ring and easily removed. It even holds toys that don't have a base. Generally, when using a strap on, you need a dildo with balls or a suction cup so it will stay in. It easily held the larger dildo without a base - in doggy and missionary positions. However, if you are planning on rougher sex or positions which pull at the dildo harder than usual, I suggest a dildo with balls or a base. The dildo without a base did slip out when we were more adventurous, but the dildo with a base did not.

The Theo is very easy to take care of. Just throw it in the washing machine and hang it up to dry. It can't really get any easier than that.

I store it in the bag that it comes with. Easy.

Theo comes in a nice black cardboard box. Inside, Theo, and the bag it comes in, are wrapped in silver tissue paper. The box is nice enough to keep to put other things in, but the bag is nice enough to store the harness on its own. I don't think it should be cooped up inside the box.

I really liked the harness. I was torn between the Joque and the Theo for a while and decided to just play with them at the store to decide. I was pretty much set on the Joque because of the easy access to my ass and vagina. Plus the under-buttcheek design of the Joque was sure to accent my butt which I loved. However, the store I went to was out of the Joque, so I ended up with the Theo. I'm glad it did. I probably wouldnt have tried a thong style (From experience, the under buttcheek style was more sturdy). I was proved wrong when I bought the Theo.

I still want the Joque, for variety's and curiosity's sake, but I love my Theo.