Some past threads: Posting while trotting...male riders Beginner adult male rider..
I've never felt my posterity were threatened, although I took up riding at 50...but anyways, looking back:
I guess anything that helps to prevent bouncing would help guys (and gals, too). I suspect most men have tighter hips that women, and it is hard to ride well when your hips are pulling your thighs together. I ride better than I did 5 years ago, and a big part is that my hips are looser. There were muscles in the thighs and hip that needed stretching.
I also had a tendency to press (brace) against the stirrups. Rigid legs makes for a bouncy ride. To this day, I can also make myself bounce if I try too hard to get my heels low or point my toes forward. Too much emphasis on 'position' can be a killer.
Riding is about movement and balance. Move with
the horse, and it won't hurt either of you. Focus on some 'position', and you can bounce in ways that hurt - male or female.
My favorite video is posted below. It shows how a rider can move with the horse: Craig Cameron Explains How To Ride The Canter On the Equicizer & Horse - YouTube
This part tends to be more controversial...but I think men find a feet forward position easier to ride in. With time, as my hips get looser, my heels have drifted back on their own. But if your hips are tight, I think the old position shown below works well until things loosen up some..provided you know to move your hips with the green arrow. If you sit static, that position will beat your horse up. I think Craig Cameron gives a good demo above: