First of all, that kind of scene could be dangerous. One thing to make sure of before you go in for any kind of kinky/weird stuff is that safety agreements are in place and safety precautions are taken. Beyond that, I’d say the main thing to go on is your own appetites and inclinations. Some people get into weird stuff and others (most) have no taste for it at all. It can be safe and fun and exciting to some and a real gross-out or turnoff to others. So what other people tell you about what they like or don’t really has nothing to do with what you might or might not like. If you are open-minded and curious, you might go along with your friend in a spirit of adventure and just see what it’s like and how it makes you feel. You probably won’t be pressured into doing anything, and if you are, you should leave. If it turns out not to be your thing, that’s the end of it.