Best Fun

It's the best fun you can have without laughing!
It's enjoyed with no need for toys
It's done in any position
It's perfect but sometimes destroys
It's driven some folks to perdition
It's sometimes done without noise
It's best if you're in good condition            
It's also done with much poise
It's useful for procreation
It's what the world most enjoys
It's a sin if you're into religion
It's sweet but oh never cloys
It's the cause of painful contagion
It's safer when protection deploys
It's perfect for fun solo action
It's the star act in all of life's joys
It's a cause for ribald reaction
BUT HEY!
It's the best fun you can have without laughing!