Am I the only one sniggering like Beavis & Butthead everytime I read this thread title? (OK, yes, so I'm just a typical bloke... but it does say 'fart'... "huh huh", and 'fanny' in the same sentance "he he, huh huh")
On a more practical note, and from a blokes perspective, i've never been in a long term relationship where this hasn't happened at some time. We've had a good giggle (Beavis style) about it, but we've always forgotten about it and carried on... It's never put me off someone or made me think less of them.