So here's the thing. Say I go to my Girl friends house at 12 we make out and I'm hard and ready to go but she isn't she just wants to make out... So we continue making out and watching movies I'm still hard I notice some pre cum but I'm still erect. So by around 4:30ish she is ready but now I cant get up.. Whats wrong with me? is it the precum that causes it to not get up?