Well, Dogs will have trouble attacking the Mail Man. There will be more reasons to send guys on errands. With fewer reasons to argue against. Gas prices as an excuse will be useless. :P
Fight or flight will take on a literal meaning.
A new midlife crisis could be born. Where guys start don super hero costumes.
Completely debilitating for guys afraid of heights. So now it's even more obvious when they don't fly somewhere.
Birds now become a problem. Men now have to worry about bird poop on a regular basis. As well as birds who may peck a guy out of fear.
Well, if a guy forgets a special day now. He can quickly fly out to pick up a gift and come back. Is less likely to be late for a date due to traffic. Can write the name of his girlfriend or wife in the clouds with a sweet message ('I love you...').
@lydocia's answer: If women shoot guys - But then, who will take out the garbage? Make dinner this week? Fly out, to pick up Milk? Bring back the massage oil, to massage sore muscles for their girl? Do the dishes? Take their turn, to pick up the kids from school?