I think it’s finding the right shorts. Need to have fabric where rubbing would be. I’m an AFAB woman but this also worked for my AMAB husband. You need a snug fit from just below the crotch to as far down as your thighs seem to regularly touch while walking. Sports shorts with built in bike short type layer under the lightweight looser short layer work great. Hit up a store like TJ Max if you have one locally to try on a variety of “workout” shorts to find a good fit. Then find that brand and fit other places. An alternative is purchasing bike shorts or boxer briefs that you like to wear and that work under your favorite shorts.