Because when they're born they get laid.
Because it ran out of cluck!
Because Croc-a-doodle-doo is a good family name.
No matter how hard God looked, he could not find three wise men or a virgin anywhere in Mexico
A virgin.
The Girl Scout that got hit by a car.
If you lay them properly the first time around you can walk all over them for the rest of your life.
A gristly bear.
Doesn't matter, still born.