Roy Short states that science has established some facts about the likely effect of premarital sexual relations on marriage:

Premarital sexual relations can lead to the couple’s separation.

Many men refuse to marry women who have had sexual relations with other men.

Generally speaking, those who have had premarital sexual relationships, have less happy marriages.

The probability of divorce is higher for those who have had premarital sexual relationships.

People who have had sexual relations before marriage are more willing to have extramarital relationships than the others.

What you earn by having a sexual relationship before marriage is nothing compared to what you lose.