Abused woman I used to work with would be dead women if divorce were illegal. Divorce is a scourge. Assault, battery, and homicide are worse.
Being obliged to have sex with someone you no longer love must be hell on women, too. Sex is not a mere bodily function to most women, but a lot of men - (certainly not all) - do see it that way.
I think sex without love is as ‘adulterous’ as anything else. Love is all that really condones it.