Is it normal to like being beaten up hard in the stomach

from the time I was 16 years old and working out for sports, I have always had pretty solid and defined abdominals. I was playing football one afternoon and was hit hard by a teammates knee in the stomach. It was a hard blow,but it didn't hurt. I took it. When I did, It felt good. I liked the feel, I was doing hundreds of sit-ups so I asked my friends to punch me in the stomach. The did and, I loved it, and have been boxing and kickboxing 30 years and love being beaten hard in the stomach muscles.