Trust me, most men would love to get their lips wrapped around your labia. Those who don't appreciate them are in general immature, or inexperienced. Your labia are a sign of sexuality, and of excitement. Just like any other enlarged part of your erogenous zones. They are seriously sexually attractive. They indicate that you are sexually excited when they swell. If you're ready to have sex with the guy you're talking to, great. If not, don't do it just to prove something.