I have heard of kegel exercises for men? I gather they are good at preventing premature ejaculation and maintaining an erection especially if one has Ed?
It's exercises for that muscle that you use to stop urine flow. You can look up how to do them online. Basically you tighten that muscle, hold it tense and then relax it a bunch of times in a row.
I've not kept up with them but it seems like they do. It takes a long time for them to work like any workout I guess.