instinct
Fucking hell the nipple thing, you read somewhere!? Not true, not even close to being true .Don't use yaoi as a source of info. It hurts the first time but if your partner takes it slow (and I mean really slow) the first time will be good. If you really like being receiver instead of the giver you're a bottom. There's alot of bottoms out there so be willing to switch if it's hard to find a partner.
How will you know if you are the bottom one?
This is really embarassing