What’s that disease?

A guy picks a woman up in a bar and takes her home.
When he takes off his shoes and socks, his toes are dreadful deformed.
"Eeek!" says the girl.
"Don’t worry,” says the guy, “I used to have toe-lio."
"You mean polio?"
"No, toe-lio." Says the guy as he continues to undress. When he takes off his pants, his
knees are horribly deformed.
"Eeek!" says the girl.
"Don’t worry,” says the guy, “I used to have the knee-sles."
"You mean measles?"
"No, knee-sles." Says the guy as he continues to undress. When he takes off his
underpants the girl says, "Don't tell me. Small-cocks!"