Most Helpful Guy
You should tell him early on so he will know that he should probably look elsewhere if he doesn't want to bind his sexual intimacy to arbitrary bureaucratic pacts.
Most Helpful Girl
Considering that many guys and even grown men view virgins as a mere conquest or trophy to polish their ego, I wouldn't recommend telling him that you are a virgin until you are sure there is a legitimate, genuine future between the two of you. Really and truly, the amount of extra skin in your vagina is none of his business nor anyone else's business unless they're a professional doctor or have EARNED YOUR TRUST enough for them to not manipulate or abuse that information. For all you know, you may not even end up liking this guy once you really get to know him and peel back the layers of who he is. So telling him you're a virgin within just a few dates or before a date isn't necessary. Plus there are guys out there who truly believe that they cannot function in a sexless relationship. However, a certain type of dream-woman could come along and they'd realize they would be a complete and utter fool to pass her by or trade her in for someone who will spread their legs yet never amount to her incredulous worth.