Back when I was still a college student and bought cheap toys (because that's all I could afford), I purchased this with my then girlfriend (now, wife) to use while we went away for a weekend trip. For readers, we are (and were then) fluid bonded, condoms were used only when anal sex was involved - otherwise we each had our own "side" to the double ended dildo.

Clit-to-clit approach (facing each other). We tried this positioning first (after all, it's usually the most filmed in those girl-on-girl films). We since discovered that it required a great deal more upper arm strength then we had. We couldn't just slide forward, towards one another on the bed without our legs getting in the way, so we had to push ourselves up, off the bed in order for their to be a small gap so that we could push against one another, fucking each other with the dildo. This however became tiring, so we decided to try it a different way.

Butt-to-butt approach (facing away). Both on our hands and knees, still vaginally inserted, we bumped butts. This was less work and effort then facing one another. For the most part it was alright. But due to our difference in clit size, my end remained stationary, while her end easily fucked her. So I was a bit disappointed by not getting much action out of it. So we thought I should just try it on my own.

Vaginal-anal (solo), was in one word: Impossible. After a good cleaning, I put a condom on one end and inserted it anally. It was a good fit, the material was accommodating enough to be manageable, easily eased in and out. However, upon bending the dildo around to insert vaginally, I only managed to get the head in - anything further would cause the anal part to dislodge and/or pop out. I attempted the physics of this several times, but in the end gave up on it, as it was too much effort - I was trying to hard, and not enjoying myself in the process.

After removing and disposing of the condom, and giving it a quick wash I decided that this was going to be a toy that we would use just only on my partner. Holding onto one end and inserting the other into her, it was something reminiscent of "fucking machines". One all fours and on her back, I was able to give her a really deep penetration, pressing my hand against her stomach, feeling how deep it went. My girlfriend really enjoyed this and kept asking for it harder and faster until at one point she had a brief black-out moment. Being concerned with sex that is approached in a safe manner, I made sure she was alright before carefully removing the dildo.

Though you cannot completely "sanitize" the jelly material (such as boiling it in water), cleaning the double dong is easy, soap and water works fine, just as long as you air dry it after - otherwise paper towel lint/dust or towel lint will stick to it. However, storing something this long proved to be difficult, as the toy cases and sleeves we had were all too small. And thinking it would be alright if left in my "toy drawer", I was mistaken when I went to get it again and discovered that it had discolored in calico-like spots where it had impacted other (mostly leather) items in my drawer.

And if that weren't enough of a deterrent, the double ended dildo began to tear, mostly in the middle, where the jelly material was under the most stress from use. Considering these tears as places where bacteria might collect and fester, after that weekend trip, the double ended dildo was retired to the trash bin.