i'm 22, and for the longest time, when my g/f and i would have sex (with a condom of course) i would often have trouble maintaining an erection long enough for her to orgasm. it was really frustrating, but I figured maybe i was not sensitive enough, so i tried a thinner condom... no dice. stage fright? we had sex ONCE without a condom (she was on birth control) and i had no problems and the sex was AMAZING. her exact words were "holy shit, we need to do THAT again, wow" well to sum it all up, it took me about 6 months to realize average size condoms were too tight and were cutting off some blood flow. i tried out trojan magnums, and, HOORAY!!!! so for you guys out there that have trouble keeping it up, try different size condoms. obviously, every guy's prick isn't the same, so why should condoms?