Thinking about having anal sex, but don't know if you're a top or bottom?
Some people think in order to be a bottom, you must be the effeminate or lesser dominant partner. And vice-versa for a top. But, this isn't always the case. A person's preference for topping (or penetrating your partner during anal) and bottoming (receiving anal) is most often determined by which they get more pleasure from (if any at all), not how they act outside of the bedroom.
That's why the best way to determine if you're a top or bottom is to experiment with your partner. If you keep an open mind and go into sex without a pre-determined idea of what should happen, you and your partner will likely fall into your natural preferences.
Sure, some guys know right away which they prefer, even before having sex for the first time. Chances are, even if they've never had anal with another guy, they have experimented during masturbation, which is also a good way to discover your pleasure preference.
And even still, some guys prefer not to label themselves or are more versatile, meaning they enjoy both topping and bottoming.
Sex is best had without anxiety. A calm, cool, relaxed body and an open mind can reward some pretty amazing sexual experiences. Instead of writing the script of what your anal encounter should be, go in with a blank canvas and let your body take control.