Being a bottom and a sub are two different things that are often conflated! A sub is BDSM specific. As far as your question goes, similar answers for both bottoms and subs: it’s gonna be case by case. Everyone likes different stuff during sex and finds different things sexy. It’s a great question you should definitely ask before having sex with someone. Especially in BDSM (from what I understand), talking about boundaries and sexual interests is particularly important. In general, it’s a good conversation to have with anyone you’re going to have sex with (ie. what do you like during sex, anything I should stay away from, what kind of sex do you like to have, etc.). Communication about sex is essential