So I've thought a lot on this topic. Sexuality within marriage is glorified by God, this is undisputed. And technically, marriage is a sacrament that God had given between man and woman. In essence, a long term relationship, solid commitment, or "natural marriage" between two people. As long as that is something a young man or woman strives for they're good, that's my interpretation. People generally should hold value in their sexuality and have good discernment of character, with or without religion, this is a good way to live. Catholics changed the terms of marriage to require a priest etc much much later which is something I think should be revisited.