I'd love to be honest, but I would be afraid that it would somehow backfire. You see, I went on a bit of a "sleeping streak" when my fiance left for another woman. I am NOT ashamed of how many partners I've had, even if it was only once, but I would hate to have it back in my face when I confront my son or daughter, whichever I may have years down the road. I would hate for them to say "Well you slept with __ people before you were 20!" when I was busy trying to guide them in their actions. I know me, and if my mother told me how many she had and then tried to confront me, I'd use her words as a weapon.
If asked, I'd try to go on with the general conversation, but I think I would avoid the question. Maybe when I have children this will change.