The number of sexual partners a woman has before marriage can predict whether their marriage will last, a new study has revealed. It found that just 5% women who had no sexual partners prior to marriage got divorced within the first five years of marriage. However, a third of those who had 10 or more sexual partners before marriage divorced within the first five years. The study examines statistics as far back as the 1970s taken from the US Centres for Disease Control – on National Family Growth.