It's quite likely men are slightly more impulsive than women. I haven't noticed that men interrupt more but then, I wasn't looking for it either.
As an aside, I don't mind getting interrupted, what I dislike tho is people who get self righteous over being interrupted. I consider a normal conversation where a person speaks for about 30 seconds and then you can respond. When someone monologues and then pulls the "don't interrupt me" bogart I consider it equally as rude as they consider interruptions.