when a guy tucks his twig and berries back by his crack when mooning someone, which ends up looking like a banana and some apples (or oranges, if you prefer) coming out of a fruitbowl!
When fornicating with a member of the opposite sex (or not depending on preference) one slips one's nuts into the action to create a lovely FruitBowl. Also see Mudbowl, similar to a Fruitbowl but the completed package of sweaty love is inserted into the anus rather than the vaginal opening
"My dear you look a trifle flushed, have you been fruitbowling it again?" enquired the First Earl of Chester of his chambermaid
"Why yes m'lord" she replied "most enthusiastically m'lord"
"Excellent" he replied "then you won't mind me slipping you a mudbowl"
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.