Luckly, I don't think I got TOO much to worry about. I'm at least active to a normal extent and i'm only 17. 155lbs and 6'1, but when my heart starts beatin so fast I feel like I should be running or something its a little odd to say the least. So how dangerous is it to have sex in the first hour? Wouldn't that like quadruple X 2 the chances?