A family were having dinner when the little boys asks his dad how many types of boobs there are. "Well, son" the dad says, "there are three: when a woman is in her 20s her boobs are like melons - round and firm; in her 30s and 40s they are like pears - still beatiful but hanging down a bit; but once she's in her 50s they're like onions - just looking at them makes you cry." The mother and daughter are a little put out at this, and the daughter asks her mum how many types of willy there are. "There are three of those as well," says mum. "When a man is in his 20s his willy is like an oak tree - firm and hard; in his 30s and 40s it is like a birch tree - flexible, yet reliable; in his 50s though it's like a christmas tree - dead from the root up and the balls are just for decoration."