No single benefit for men in marriage to be honest. Imagine providing , protecting, mowing the lawn, lifting the heavy items, repairing the generator, fixing the cars, working at the shore, planning dates, buying dress, paying for uber, spending all your earnings on a woman who just do nothing in return.
This is why I advise every man to marry their fellow man so that efforts can match and the other person will understand your sacrifice well because they are in that position too.