Okay..so im going to have sex with my girlfriend for the first time. She's a virgin, and my penis is pretty large, 9 inches x 6 inches. My last girlfriend was also a virgin, and the one time we had sex was a disaster because she was in incredible pain and i could barely squeeze my penis in. I don't want the same thing happening again. Anybody, are their any suggestions on what I can do to to to stop a repeat from happening?