I doubt it has something to do with gynecomastia. I like nipple play and never had gynecomastia.
We aren't that different from women. :wink:Different guys are different. "All" guys don't do anything, and you've got to learn what turns on your particular guy. Get used to it.
My nippes (especially my left) are extremely sensitive. It's like they're "hard wired" to my dick. If someone licks my nipple with the tip of their tongue it drives me nuts! I actually get more pleasure from that than a BJ.