for a child, once it sets in, is an all-consuming drive and not something most humans can just ignore or dismiss, no matter how much they love their partner. It becomes a single-minded, passionate need - you've only got to look at some of the lengths people who have problems conceiving will go to to achieve a pregnancy - I mean, don't take it for granted that you actually CAN have one until you try - but then that's a whole new dilemma...

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"There's this thing called being so open-minded your brains drop out". - Richard Dawkins