/g/ is for all things girly, bathroom talk for advice, lifestyle, fashion, cosmetics, makeup, periodtalk. Anything you would ask and talk about with your female friends.
>/ot/ is for offtopic, discussions, debates and sperging>/m/ is for image spam unrelated to beauty or vidya and movie talk
Do not post porn, talking about porn or sexual preferences is fine though.
You can see all the rules here https://lolcow.farm/rules