Bisexuals are greedy bastards who aren't satisfied which is just one gender. As a result, they screw like rabbits and need frequent breaks.
Asexuals are frustrated bastards who sublimate their desire for sex with eating - and completely losing their shit from time to time.
I don't get the pansexual one. Technically they are people who aren't bound by having sex just with members of their own species. I guess that includes inanimate objects like kitchenware but I don't really get it.
The lesbian one is obvious - eating out is a euphemism for oral.