Little Johnny Jokes: What are the ribs for?

Johnny went to the drugstore for some condoms. He walked up to the druggist and asked, "Sir, can you tell me where the ribbed condoms are?" The druggist asked, "Son, do you know what condoms are used for?" "Sure do," replied Johnny, "they keep you from getting veneral diseases." "O.K." said the druggist, "do you know what the ribs are for??" Lil’ Johnny thought for a minute, then looked up at the druggist and replied, "Well, not exactly, but they sure do make the hair on my goat’s back stand up."