Three. One to post it, and two to repost it.
Not possible. Their hands are too slippery with each other's ejaculate.
Cirque le Jerk
There aren't jokes here. There are reposts here.
Because you already read-it.
You're too young to smoke. Sorry, it's the first joke I ever learned, and I haven't ever seen it posted.
Everywhere else.
Concentration Camps
Because the instructions usually say: "Take after meals."
Because he gets so many letters from dyslexic children.
Bee.