Hi there, my first post here - it's very long but I'd appreciate some insight into a problem I have. I'm average-sized: 6'' length, 5'' girth. Every girl I've been with appreciated it, my ex girlfriend came about 4-5 times each time we had sex. But with my current girlfriend the situation is different, and something happened a while ago. When we were having sex she definitely felt pleasure, but nothing out of this world, and it was definitely a downgrade in comparison to how much my ex-girlfriend enjoyed it and came repeatedly. At some point my current girlfriend confided me that she's never come in her life, EVER. I tried everything: penetration, oral sex, stimulating the g-point, nothing, and also she didn't seem to enjoy it THAT much. I felt really bad and I wanted to both help her and find out whether the problem is her or the average to smallish guys she's had sex with (she had never been with a huge cock, and indeed she's pretty wide down there I can barely feel it myself when I'm in her and I'm 5'' in girth). There's a friend of mine who's got quite a reputation at university: 7.5''x6.5'', with a 2'' diameter, and it was measured: I've seen a sextape he's done with his ex-girlfriend and HIS hand can't even go fully around it, it's huge. Plus he's a hot stud with a six pack and a great body and he's a master at rough sex. I thought of trying to make my girlfriend and him hook up, I'm pretty liberal plus I needed to know if it was a problem of size. My friend is a total sexmachine so after I explained him the situation he accepted as soon as he understood it wasn't a problem for me, plus he likes my girlfriend as she has a not very goodlooking face honestly but a fantastic body: average height, slim, huge rock-hard breasts that point straight up defying the law of gravity and an athletic backside. I talked to her and in the beginning she would have none of it; then I showed her a photo of my friend in speedos with a VERY evident bulge right below his tanned sixpack. She made some customary resistance and after my repeated saying I wanted it for her good and that I was totally fine with it and maybe it would help our relationship by helping her release any sexual frustration, she accepted. Without getting into the details of how long and troublesome it's been to hook'em up, they ended up having sex. Not only she came multiple times, but now she can't stop thinking of him. When we talked about him she told me how amazing it was, and we ended up having sex: she was already dripping wet with no foreplay, only by the thought of him. When we have sex it's clear her mind is elsewhere and I'm afraid she thinks of him. She's bought herself an 8x6 dildo and she asks me to use it on her and again her mind is totally elsewhere (thinking of him again?). Plus my friend told me that she gave him head very passionately for about 15-20 minutes, whereas she gives me head a few times and only for as long as it takes me to get ready: she was totally worshipping his cock. I'm afraid they are (or will) continue their sex relationship and it will turn into cheating on me. I've tried to help her and I ended up doing her a favour while destroying my self-confidence. She really loves me, and outside of sex she's a fantastic girlfriend, but I can see she needs more and she's totally engulfed by my friend. Would you think this is a good reason to break up? What should I do since I totally cannot grow a bigger penis which is anyway already average so I shouldn't necessarily feel so bad I guess... any advice?