Well, I think the definition of "virginity" is whatever you are comfortable with in terms of being intimate. Let me explain... the general definition of virginity is not having had sexual intercourse, but if you feel that oral sex constitutes "losing your virginity," that's not wrong, per se, it's just what you feel comfortable with.

Me, I go with the old-fashioned definition--if tab A enters slot B, it's sex, you're not a virgin. ^.^ Things get complicated with homosexual relationships, and in that case it's more of a "touching genitals" thing.