I'm just wondering if anyone else has/had the same problem and how to overcome it? I've seen in an article that penis can broke and as I've started having sex with my gf I can't relax when she's on the top. It makes me feel like I'm missing a lot but being scared I just don't know what to do anymore to be ok with it. Any help?
When she gets on top, or any other time during sex, talk to her. Tell her how it feels, where she is doing the most good, and when she is putting stress on your cock to where it hurts. Let her know what feels good and what doesn't. Myself for example can't allow my partner to lean back very far when she faces me in cowgirl position. Her bending my cock down towards my feet causes pain in my groin. I let every new partner know and even remind old ones of this if they get in the CG position. Plus I hold her by the hands, arms, around the back, anything to keep her from leaning back to far. So far my cock has survived my escapades. Just let your partner know what you are feeling. This also allows her to open up and tell you how she is feeling. She may be leaning back a certain way so that the head of your cock is right on her G spot. There are ways to adjust the insertion for maximum pleasure, minimum pain for both. Talking about sex while doing it makes the encounter a lot better. Don't be afraid to speak up.
Express your concerns, and ask her not to bounce bounce around like a porn star bunny rabbit. Ask her to start gentle and go from there.
Yikes! That is wild. Her is an analogy: I'm sure a penis striking a cervix can lead to damage long term, but that is not going to make me worry about having rear-entry sex. If I were you I would roll the dice and enjoy it.