Most Helpful Guy
Just say you want to take things slow. If he asks (way down the line please - not after a week), then you can tell him if you're comfortable with it. And you don't have to explain it. If he can't handle that, then he's not for you.
I never got how being a virgin was such a horrible thing. If it's your choice, then it's your choice. Even if you haven't slept with a guy because none are interested at the moment, that means very little.
It's like drinking. People make such a huge darn issue about it. Same with being a virgin. I'm a virgin at 35; I'm kind of proud of that. Considering if I had had sex with the girls I THOUGHT were cool at one time? Who knows what diseases I'd have? - Even from the supposed "good girls."
So don't worry about it. Don't just do it to get it done and over with or because you want to be cool or whatever - do it because you love the guy; because you feel a huge amount of commitment to the guy; do it when YOU want to. Feel free when you are mature enough to handle it without it causing huge issues. Don't do it for peer pressure.
Most Helpful Girl
There's nothing wrong with it. As you see yourself here most guys don't really care. Just tell him when you will be about to have sex. Not earlier not later. Just something like :"I just want you to know that I'm still a virgin. It just didn't happen before. It's not like I tried to avoid it, until marriage or something. It's just never happened... " or however it comes out. Just don't tell him earlier than that time, because you will be putting yourself in the position of "something is wrong with me "when there's nothing wrong. Really... Virginity is just overrated...