I always make my parents (to be) take a shower before trying for a baby. If they are happy, not tired, and clean I usually have success. If one is "not feeling fresh" they don't concieve. Whether being clean or not has any bearing or if I have just been lucky, I don't know. I've had triplets several times in th past two weeks, still haven't had twins though. The don't always want to take a shower though.

They also clean the house and yard much quicker.