1. The first is men who have had massive weight loss and want to have loose or redundant skin and fat removed. It can be disappointing to lose a significant amount of weight, doing everything possible to look better on your own, and yet still have hanging skin. A tummy tuck can eliminate that skin, making a man look much better both in and out of clothes.
2. The second group of men who get tummy tucks is men who developed a separation between their abdominal muscles. Despite being thin and oftentimes having little fat between the skin and abdominal muscles, they joke that they can look pregnant. Some of the men also have an "outie" belly button.