Cosmo would like you to know what not to joke about with your guy. Penis size, his income, his mom - really, ladies, if you need to be told this stuff, you've either never had a male friend before, or you're a contestant on Tough Love. The list is also woefully incomplete: I'd like to add "don't joke about your boyfriend's sex dreams, in which they are having gay sex with male characters from TV shows." I mean, I hear people have gay sex dreams sometimes. It doesn't mean they're gay, it's just a dream they have. Somewhere, somebody. I don't know. STOP PRYING INTO MY PERSONAL LIFE. Anyways, yeah, those jokes are off limits, too.