As a bio/identifying guy...
Positives
1) Not being a "token" in field of math.
2) Easy masturbation.
3) Not being a "token" in anything, really. It's not that often society talks about male exceptions.
4) Never being *expected* to wear a skirt/dress that can be cumbersome.
5) Not being hit on by every creep trying to get into someone's pants.
6) I never had to worry about a clothing gift that would make me look like a person of easy virtue.
7) Along the lines of #4, not being expected to wear make-up or high-heels. Huzzah!
Negatives
1) As mentioned earlier, wearing a dress is pretty much forbidden for serious purposes. Generally I don't want to wear them, but there's times it'd be damned nice. It may not stop me, though.
2) Facing pressure to bulk up. This stipulation seems to have abated with time, though.
3) Being expected to be a man-whore. Like #2, this seems to have declined in time.
4) Typically being treated as a man-whore whenever I'm friendly with a female that's of age for dating, even when I'm just being friendly. Of course, if the female of interest gives me that sort of treatment, she's probably sexist and/or an idiot anyway, and I likely wouldn't be good friends with them. Of course, most women and men seem to be sexists and/or idiots, so life gets pretty frustrating...