Idiots who can't handle their sniff. If i ever do it now it is exclusively used as a little kicker for us in the bedroom. She tried to do a line the length of my wang off it but ofc she had to try like 4-5 times (looks around nervously hoping nobody notices this little exaggeration). Anyway, yeah it can be fun in moderation and in the right circumstances, if you can hack it. You do hear about sex sessions going to far though, usually with a poor now sober bloke with a "what the fuck have i done" look on his face looking at a long stretch inside. So it can turn some people the wrong way, they should recognize it and stop doing it.