Is something wrong with my penis or my girl?
So I'm new to this place, I was recommended by a friend and he said it helped him and his girl out a lot, so I figured I would try my problem here.
I've been dating my girlfriend for about a year and two months now, and we've been very happy. Not that it's anything super long, but we've been able to retain a solid chemistry and be pretty open to each other about stuff. We both lost our virginity to each other, so the only intercourse experience we've had is with each other. I watch a decent amount of porn so I know what to do, but from what she tells me she doesn't watch porn so she says she is usually guessing about what to do in sex. We have sex usually once or twice a week, but this past time after we were done, we got to pillow talking and we talked about our sex life a little bit. She told me that she has never came while the two of us have sex, and that she only does when I eat her out. She says that sex is good, but she sometimes gets frustrated that she can't cum and gets secretly upset and holds it against me sometimes. She talked to her sister about it (awkward, i thought) and her sister said the first time she came was a little over a year and a half into her relationship after a night of drinking on a trip to Bermuda - basically saying it was the same thing for her but after that night it was like something switched and it's been great ever since. After we had the talk about it, the next few times we had sex I could tell she was bothered by not cumming, so my question is, what can i/do i do to make sex better for her? Is there something wrong with my penis or my girl? Help!