They’re extremely hot, although I haven’t yet found a companion who can “fuck” me through the hole in my size-large tunnel, as shown in the illustration! But there are lots of other highly erotic ways to use them. First off, they come in several colors. My favorite is the clear one because it gives you the best view, lets your Top look at the anal lips, the short tube of muscle his cock is usually up against during regular fucking, and (with a light) turns the entire anal chamber into a lantern, with the prostate highlighted for viewing. But I also love the red ones. There’s something really lewd and vulgar about how they look inserted, kind of like a Las Vegas Call Girl’s exaggerated lips, and when pushed up tight against the anus with the hole open and the sphincters and everything up to the prostate visible to onlooking Tops, it just totally turns one’s manhole into an obscene and raunchy pussy. Also a good entrance for inserting (watered down, room temperature) drinks or just dawdling with one’s finger, stroking the internal walls of the rectum, watching the anal muscles squirm and respond. The tunnel I bought was featured together with one of the new “colon” dildoes—those skinny, long and flexible tubes that make even some veterans climb the walls when they feel their “second ring” breached and the tube going where “no man has gone before” (or at least usually none that same evening). But even though the tunnel was their largest size, there’s no possible way to get even the small end of the tube through the opening!!?? Bad sales gimmick, but I saved a few dollars for buying both so no real complaints.
Fun to make the bottom wear the tunnel, then (in a group scene) turn his butt into a target. You can use squirt-guns, whatever your imagination comes up with. My favorite is having a row of men stand behind a line (usually 5-6 ft), then see who can empty the most from their bladders into the mysterious flesh cave of the bottom. Add to the fun by removing the tunnel, then making him hold the fluid until given permission to evacuate.
Just having one makes your imagination go wild, and size-wise, they’re so soft and collapsible I don’t think anyone would have a problem shoving and squeezing the largest model up in there.