[SD]Master_Wong wrote:
i didnt say life was driven by them i said its usually what brings two people together, not always but even in a relationship why do we have sex if we dont intend to reproduce when we do it?
Sexual tension causes stress. Stress makes you cranky. Relieve that stress and you're not cranky anymore!

(I'm speaking relationship-wise)
On can relieve the stress by wanking as well.