A good sense of humour is probably the most appealing trait I could find in a human, male or female. It's a huge factor in that big nebulous "Personality" group of skills that you hear so much about. As a man I surely don't vocalise this as being the reason for my attraction to women that much, but it sure as hell is a huge factor. It's just guys are more expected to just say "Yeah I like her 'cause she's got a hot ass and a sweet pair of tits" but that'll get tired in a hurry.
This being said I find a lot of women don't make me laught like guys do. When I find one that does, it's pretty hot.