This analogy came from a dear friend of mine. Posting it here because it totally rocks !
'Sex is like ice-cream' says she. 'It is available all over the place, in more flavours than you can imagine. You've got to find the varieties you like, and you're better off sticking to them. It is equally important to try out a new flavour if it looks good to you. And remember not to eat too much of it too often, because that kills the joy it brings'.