by KARLEY SCIORTINO As a culture, we have an embarrassingly simplistic idea of what sex is. Essentially: dick in vagina. When there’s no dick involved, our brains short-circuit, and sex becomes literally incomprehensible. This is why, when you’re a woman dating another woman, you often have to put up with drunk guys asking you, “But wait, how do lesbians even have sex, anyway?” They’re usually half-joking, half-serious. I’ve now honed a stock response: “It’s just like in lesbian porn,” I say. “We 69 wearing stilettos on the kitchen floor, and then after about five minutes, our landlord comes in and fucks both of us.” Some people even believe that if you hook up with someone outside of your relationship, and do everything except sticking it in, then it wasn’t really cheating. Right. I find this bizarre because in my experience, penetration is often the least intimate part of a…