You guys may be better at this than me but
Doing the same thing without increasing the difficulty is going to plateau, and it's usually a good idea to give muscle groups a day off so they have time to knit and rebuild.
That and the girl fat. To be fair, most men don't have well defined abs either. The one place men do pack on fat is straight to the stomach. Most *people* don't have great midsections.
Try getting food poisoning* I almost died at the start of the month and couldn't eat for a week and lost all of the stomach fat I'd gained over the past year, but mostly kept my ass, thighs, and boobs.
*not really recommended.