Double headed dildo's

Insightful breakdown of Double ended dildo:

Double dildos - how to cum together - the double dildo unicorn
For all the lesbians out there: I'm having a hard time finding great toys that allow for specific tastes in size, texture, and positional flexibility.

Best first harness-less double dildo
I'm interested in getting my first double dildo for me and my gf. I'm worried about the ways these dildos sit inside the giver. I'm especially...

Double Dildo
Can anyone tell me if it's possible to use a double dildo with this panty harness? I can't tell from the photos if it would work or not. Thanks!

Longest double-ended dildo?
(on the longer end), which is the longest double-ended dildo? Feeldoe XL, Share XL or some other one I've never seen?

Best/Firmest Double Dong?
I am looking at the double ended dildos (not the ones for doing a partner with like strapless strapons, I want the straight, long, noodly kind). I...

Mark one? Also, if you keep a condom on it during use, it shouldn't matter.

Which one's yours vs someone else's? I'd say go ahead and write on the dildo with a permanent marker. Jelly is not the best material from a safety standpoint, so you might want to look at something else.