Hey when you think of it, a human is just a skin bag filled with muscles and bones and fat and entrails and shit. If you're happy enough to kiss this flesh bag filled with all that stuff, I don't see why kissing a vagina is that bad. French kissing someone is MUCH more unhygenic. The mouth is such a dirty place filled with all kinds of nasty bacteria. So what if a girl pees from her vagina. Urine is pretty damn sterile. There isn't anything wrong with blood either. Sure, its not a pleasent image, but blood is just blood. Red water.
Anyway, you guys are just missing out. Oral sex is an awesome thing. The mouth can do ALOT of things that the rest of you can't. I feel sorry for those who are too prude to incorporate it into your sex lives.