I'm not sure about abs specifically. But I do know there's a real fetish for belly punching in general. It can be mild or forceful, and of course it can be a real turn on. Weird is wonderful!
Strange? Well it's not everyone's cup of tea. But lots of guys are into it. If you have good abs it can be a very hot experience to get them punched. Or if you have a partner with good abs, it can be really hot to go at his.
This is something ive always wanted to try, but have never had a partner willing to really sock it to me. And its not exactly something im able to inflict upon myself.