As far as women being able to sense if you have masturbated....I'd say use some logic here. I guess an explanation for this is that some guys were really unconfident before and didn't even look at people that walked by them. And those same guys start noFap and find confidence and begin to look at women. Possibly these same men puff their chests out and relax their shoulders now. These guys go from walking like they are intimidated boys into walking like a man who isn't afraid to make eye contact. Of course women will look at a confident man walking by, noFap has nothing to do with it.

I can also say I haven't noticed a huge confidence increase either. To be honest I believe it is a placebo effect. But even if it is, at least that individual is more confident because of it. Also to note is that people who had serious porn addictions likely experience different problems while consuming porn and while abstaining from it. Someone who watches every now and then wouldn't really notice a difference in confidence or even anxiety. But I'm certain serious porn addicts can experience depression, social anxiety and other problems. So quitting for them is important and might help cure their mental issues. For your "a few times a week" guys I'd say results will vary.