hi, im a 17 year old virgin and me and my girlfriend are ready for sex. however i have a problem, when i masterbate its fine, i dont cum early or anything like that, but as soon as we start doing anything together, i get lots of pre cum, which is a problem, it happens over stupid things and happens alot, even if she hugs me wrong it happens. also, all she has to do is rub 'downstairs' on me even through my clothes and i nearly instantly cum, im afraid im not even gonna last long enought to start intercourse. can someone please help.