[Woku]

Until a couple of days ago I was still a virgin. My 'friend w/ benefits" and I have slept together almost every night since than, and she seems to enjoy herself. When we hug and snuggle and have fun in for-play I get aroused easily (I’m a guy). But when it comes to sex I’m not as erect and find myself going limp towards the end of the activity (not like after ejaculation, just like we you get a hard one and you ignore and it goes down).... and I get no enjoyment out of it, I cant even climate or ejaculate. It so bad that I have to fake an organism (well make it seem like I'm in pleasure) and then act like I have finished. Only after I’m sure he has enjoyed her self thoroughly.... After sex she would ask "Why do you go so long?" of course I answer w/ some cocky guy answer. Any other time I get unwanted erection while around her but when it come to sex I don’t know what happens. She is a very attractive women (I MEAN REALLYATTRACTIVE) and I'm not gay (trust me), so what the hell going on. Is there something I can do to up my sensitivity, or at least be able to enjoy sex? Or is there something wrong with me? I'm lost can any of you help me, what should I do. PLEASE HELP!!!!!!