When a man is attacking a woman its usually going to be in a controlling manner: grabbing, pulling, pushing, slapping, holding, etc.. It this type of stimulus, in my opinion, where styles like Wing Chun and Aikido shine as intelligent choices for women in self defense (and I highly suggest adding BJJ for the ground).
When a man attacks another man, unless he intends to grapple, it's usually going to be to pummel them into mash potatoes as quickly as possible. I think Wing Chun shines through best for a man when in a confined space (where movement is very limited), or if the attacker is crowding him. Much less trapping will likely be involved for the WC man as he attacks his opponent's center line, and the "T-position" becomes highly favorable to gain to limit the attacker's movement; likely causing him to try and use the controlling stimulus that Wing Chun will thrive on. So I think for the male Wing Chun practitioner, it would be wise to add a long distance game (I suggest JKD); although I don't think this is necessary if you are only taking WC for self defense purposes. What you will commonly see in the WC vs. anything videos, is the WC man standing like a statue waiting for the close quarters stimulus that his style feeds on, but getting mowed down because he has no long range or ground game.
Hope that helps.
