there are a few, but it would depend on the terms. . . if i haven't had sex for a while, i finish way too quickly! if i have or at least have masturbated consistently, i can control myself pretty well! but being with some one usually relegated to your fantasies, i would be too anxious to control myself, at least that is what i think!
not that i have ever had the chance, but them again, porno dan is around here. . . lol