Successful marriage requires virtue

This chart shows data regarding the success rate of marriage when the bride has had other sexual partners. You'll note that marrying a virginal woman is an almost iron-clad guarantee that the marriage will not end in divorce. Just one sexual partner lowers the success rate to barely 50/50, and by the time a woman has had 16+ sexual partners, a successful marriage is rather unlikely.

I do not have data on the groom.