It's probably a good thing you guys all failed because after about 10 days if you haven't shot your load your sperm get thick and rubbish at doing there job once released.
More info here
YouTube - Mary Roach: 10 things you didn't know about orgasm
and there's some other stuff including some hot pig action! It's also pretty funny
"Is it wrong for a man to love his guitar?"
"It is if he puts his balls between the strings, and strums himself to ecstasy!"