Chastity before marriage has been found to drastically improve relationship stability, satisfaction, sexual quality, and communication within marriage.
According to the BYU newsroom article Good Things Come to Couples Who Wait, a study done at BYU and published in the American Psychological Association’s December 2010 Journal of Family Psychology (Busby, D. M., Carroll, J. S., Willoughby, B. J. (2010). Compatibility or restraint: The effects of sexual timing on marriage relationships. Journal of Family Psychology, 24, 766-774), finds that the timing of sexual intimacy in a relationship matters in terms of its effect on stability measures.
The BYU article linked above notes:
“Most research on the topic is focused on individuals’ experiences and not the timing within a relationship,” said lead study author Dean Busby, a professor in Brigham Young University’s School of Family Life. “There’s more to a relationship than sex, but we did find that those who waited longer were happier with the sexual aspect of their relationship,” Busby added. “I think it’s because they’ve learned to talk and have the skills to work with issues that come up.”
The BYU article also states:
I am so grateful for inspired Church leaders who have encouraged, promoted, and exhorted the Lord's commandment to live the law of chastity; for instance, The Family: A Proclamation to the World states:Sociologist Mark Regnerus of the University of Texas at Austin, who was not involved with this research, read the study and shared his take on the findings. “Couples who hit the honeymoon too early – that is, prioritize sex promptly at the outset of a relationship – often find their relationships underdeveloped when it comes to the qualities that make relationships stable and spouses reliable and trustworthy,” said Regnerus.
We further declare that God has commanded that the sacred powers of procreation are to be employed only between man and woman, lawfully wedded as husband and wife.Our Creator truly knows what is best for us and how we can be happy. The surest way to experience the joy He intends for us is by obedience to His laws and commandments.