Xenon wrote...
Anyway, my opinion is that they don't have to have sex at all if you're that unsure about it. It will take a lot of research to write about a topic with confidence, and even more research to write about a topic you know nothing about.
On that note, don't feel obligated to get every detail down. If you research all about what it's like for two guys to have sex, don't feel like you have to try and squeeze in everything you come across because you probably shouldn't. Chances are, it'd make for a boring, cumbersome scene.