How about religion

'It is allowed, Mohamed had multiple wives'.

That was in a time when women outnumbered men by huge multiples since men were dying in wars and huntings.

Now we are living in a different era. While it could be considered a noble and good thing to take care of a widow and multiple women in the year 400, this does not justify in any way a lust-driven instinctive poor and selfish solution to an ego driven selfish midlife crisis.

The much better solution to midlife is to make some of efforts, simple efforts to find true love with your wife, respect her more than anybody else in the world and not let her suffer in silence because of a misplaced male ego problem...