oaky im a 17 year old virgin a few months back (december) me and my g/f at the time were dry humping on her water bed, and i did not get an erection weird right? we did the same thing a few days later and same problem we stopped seing each other before we could do anything again, not because of this tho well 5 days ago my new g/f and i were fooling around on her couch (we have been going out a month, i have fingered her a bungh of times and gone down on her, and she has yet to return the favour) things got pretty steamy, we went to the floor where i then picked her up and put her on the couch with me in between her legs. she undoes my pants (she was only wearing sweats, with no underwear) i had a semi-erection and i was about to put it into her, when i hear a noise, assumed it was her dad, and i put it away. the noise wsa her dog or soemthing, and my semi-erection was lost we went back onto the couch, with me on top, and she pulled my limp dick out, and she attempted to get it up, with no sucess last night, same thing, then i made her get up and i lied down, she got on me, couldnt get me stiff i tried with my hand while she helped (squeezing tits, playing with herself etc.) but still nothing i did get a semi-erection again, but it went away after 5 seconds or something she finally quit it is very frustrating for the both of us im pretty sure its cuz of nervousness i tried not thinking about it, just watching her play with herself - nothing any tips???