Whenever I hook up with a guy, I feel like I'm letting him and myself down because my body refuses to allow him to penetrate me. But it's not that I don't want it to happen I am all down for the sex, I want it I'm into it I want it to be a fantastic, fun and obviously sexy experience but whenever it goes down my body refuses, there's enough lubrication but it's my muscles. I don't know why this happens and I don't want my sex life to be a dud or for me to not be able to have relationships because of this problem. Can anyone help me and give me some advice?? It's always painful during sex but it's starting to become emotionally painful because I can't do something so many girls can. Please please help me.