I was in my brother's room and saw a (un-openec of course) condom. I decided to try wearing a condom while I masturbated. So when I got an erection, I put it on and it fit perfectly, but I didn't have any trouble putting it on, yet I keep hearing that it's difficult to get it on the first time you have seex so that got me really nervous. Is it more difficult to put on a condom when you're about to have sex? Why?