No sperm? No problem. The Known Donor Registry, a social networking site for free sperm, connects women with sperm donors who will go on to have some role in their kid's life.
But are men using it to prey on women online?
Around 30 years ago, some guy jerked off into a cup and the sperm was frozen until a team of doctors dethawed it and injected it into some lady's egg that was in a petri dish or something.