I almost thought it was actually possible for a man & woman to be friends - then I remembered When Harry Met Sally... Its actually making me take a step back and examine my relationships with the few male friends I have (none of which I have ANY desire to have sex with - the thought makes me sick).
Harry: No Man can be friends with a woman he finds attractive, he always wants to have sex with her.
Sally: So you are saying a man CAN be friends with a woman he finds unattractive.
Harry: No, you pretty much want to have sex with them too.
(Thanks to Ordinary Joe for having this dialogue posted on his blog.)