I don't see the point in lying about it if you're past a certain age. If it's to a group of people, so what if you're a virgin? The worst mistake I think people can make is believing that joining in the whore house games that most modern people now play will make you a better adjusted person.. when actually these people who are so sexually "free" are damaged mentally (can't prove this, my subjective opinion).
I always avoided the question or talk about sex until the age of 25 when I met my first girlfriend. I think I lied once at uni when I was 18, but I didn't have the self-confidence then to believe I was ok the way I was. But when I admitted the truth to her and she accepted me for who I was at 25, well, it made me feel good. I don't think it's morally wrong to lie about it, but what's the point? If someone is not willing to accept you as you are at that point then keep moving until you do find someone.
Why be ashamed of who you are? This fucking degenerate society we live in is obsessed with sex in an unhealthy way, and it pisses me off. Giving in to peer pressure from a bunch of fucktards solves nothing. The people who are older and still a virgin are no more screwed up than the rest of the non-virgins! Forget what society thinks on this issue and just have belief in yourself.. most people don't have a fucking clue anyway so why get hung up about what they think?