Volume of shots fired & conditions under which they are fired of course play a major role in this. I recall on one occasion using 1 factory 1 1/4 oz 3" 20 gauge load of #4 shot to kill a young Blue Goose from a 6 1/4 lb double. (Italian Rich-land 707). Didn't feel a thing when she went off. A couple hundred rounds in an afternoon on a range would be a totally different thing.
A younger co-worker of mine, he was abou 40 at the time, bought a used Spanish 12 gauge double. 28" barreled, DTNE, choked I/C-Mod with factory 3" chambers. He put one of those
1 7/8 oz Roman Candle loads in each barrel, picked out something to shoot at, threw it to his shoulder with a finger on each trigger. He yanked both triggers simultaneously & there was one big loud Ka-Bloom. He was laughing as he lowered the gun & said she's just a mere Pussy-Cat & went on his merry way. Sure sounds like a big bunch of Sissies around here to me.
Miller/TN
I bet he would not do that 10-20 times in fairly rapid succession! IMO, there is nothing manly about absorbing unnecessary recoil. Recoil is cumulative in that the more you shoot over time the more sensitive you will become. I have to admit though that some people are just more able to absorb it for longer periods without developing a flinch.