I could live without sex I have a hand and if that fails, then I'll just chop the nuts off and not have to worry about it anymore
I learnt the the 7 human needs in one of my course units, sex was one of them, officially. self realisation/actualisation was another.
A basic list of human needs for survival was proposed by a MAN named Maslow - in which sex was on the list... So was EXCRETION, which is resminisent of your post!
water I like water, can't live without that, oh and my head phones to drown out all the other crappy noise of real life!