Men have higher body temperatures than women. If your heating goes out in winter, I recommend sleeping next to a man. Men are like portable heaters that snore. Women take clothing much more seriously than men. There's another man wearing a black tuxedo.
Most men hate to shop.
If a man prepares dinner for you and the salad contains three or more types of lettuce, he is serious. Men own basketball teams. Every year cheerleaders' outfits get tighter and briefer, and players' shorts get baggier and longer. No man is charming all of the time. Even Cary Grant is on record saying he wished he could be Cary Grant.