When the guy cant finish in a condom...

Mallory
So the guy I am into finds it more difficult to come in a condom than without a condom. But I told him that I don't feel as safe as I can be without a condom on. I mean we are only in our early 20s so we really shouldn't be messing around with unprotected sex because of STDs and pregnancy. But I also feel bad that he can't come in a condom. It makes me feel like I suck. What do I do?