"In having relations with someone of the opposite sex, you are 1) admitting you desire them, 2) admitting they can fulfill you in a way you cannot fulfill yourself, 3) renouncing the possibility of having sex with anyone else and giving yourself to them and your children, and 4) imitating God’s creativity by participating in the creation of new life. Thus, a good marriage engages all four levels that Spitzer describes."

Studies Cited:

David Briggs, “5 Ways Faith Contributes to Strong Marriages, New Studies Suggest,” https://www.huffpost.com/entry/5-ways-faith-contributes_b_6294716