There's an old saying: "A man with one wristwatch knows what time it is. A man with two watches is never sure."
A woman with seven watches has one to go with any occasion. ;)
I also consider a wristwatch to be in the category of "feminine apparel" (i.e. necklace, bracelet, earrings). Now I wouldn't call a man wearing a wristwatch a sissy, necessarily, but there is nothing particularly manly about a wristwatch.