The suction cup by Tantus is an effective way to convert dildos (with holes for bullets) into, well, standing dildos. It can be used on any smooth surface including but not limited to linoleum floors, shower walls, and textbooks, although I wouldn't necessarily recommend using the latter for obvious reasons.

Throughout this review, keep in mind that I tried this toy with my Tantus Niagara and Rascal O2 and my Vixen Astrovibe.

First, let's go over the directions for this toy. First you have to lube up the projection that goes into the bullet hole. If you skip this step, you risk tearing your toy. Then, you have to slide the protrusion into your toy. Keep in mind that there is air already in the bullet hole of the dildo, so you'll have to squeeze the air out while simultaneously pushing the dildo onto the protrusion. I find it's easiest to squeeze the base of the dildo so the opening looks a little flat, like an eyelid. This way you can push the cup onto the dildo while allowing air to escape through the corners. If you don't do this, the dildo won't sit completely on the suction cup which might result in the dildo becoming dislodged from the suction cup during use.

As far as removal, take care when doing so. My Tantus toys formed a vacuum seal over the suction cup, so I squeezed their bases like I did during insertion which let air into the bullet hole. Then I carefully pulled the toy off.

The Astrovibe sat on the suction cup, however it didn't create a vacuum seal like my other Tantus toys did. Instead the Astrovibe simply sat on the cup. It didn't fall off because it was bottom heavy, but it was relatively easy to pull off. This wasn't an issue during use.

Cleaning is a breeze - just wash with soap and water as the toy is 100% silicone. This toy can be sanitized in boiling water, or via a 10% bleach solution.

While this toy comes in classic Tantus packaging (ie a plastic clam-shell esque encasing), I find it easiest to store in a ziploc bag.

Up until I tried the squeezing trick, I couldn't get my dildos to sit completely on the suction cup. They'd only make it about halfway down the little protrusion. So I was having issues. But when I refined my technique, this cup worked like a charm. It also works differently with different dildos. For instance, with my Niagara, it flopped around a lot. But this was due to the weight distribution of the dildo. It stood straight up with my Rascal.

Overall I loved this toy with all 3 of my dildos. It just requires care and patience.