I'll look up a more definitive answer, but here's an off the cuff response. Catholic doctrine holds that the purpose of human sexuality is primarily the production of offspring. This purpose should only be pursued within the context of marriage. God established marriage as between a man and a woman. Support for this view is found in scripture, such as in Leviticus where homosexuality is condemned, and possibly in the writings of Saint Paul. (Among those condemned are something that my Bible translates as "effeminates".)...
Super close. The only digression is that sex between a husband and wife is not just for the production of offspring (and I believe you understand that, because you included the word "primarily"). Sex should always be open to the possibility of procreation, and that's why most means of birth control are prohibited.
Sex between a husband and wife is also always an expression of complete love thorough a physical, human act:
SourceSexuality is ordered to the conjugal love of man and woman. In marriage the physical intimacy of the spouses becomes a sign and pledge of spiritual communion. Marriage bonds between baptized persons are sanctified by the sacrament.
Sexuality, by means of which man and woman give themselves to one another through the acts which are proper and exclusive to spouses, is not something simply biological, but concerns the innermost being of the human person as such. It is realized in a truly human way only if it is an integral part of the love by which a man and woman commit themselves totally to one another until death
"The acts in marriage by which the intimate and chaste union of the spouses takes place are noble and honorable; the truly human performance of these acts fosters the self-giving they signify and enriches the spouses in joy and gratitude." Sexuality is a source of joy and pleasure:
The Creator himself . . . established that in the [generative] function, spouses should experience pleasure and enjoyment of body and spirit. Therefore, the spouses do nothing evil in seeking this pleasure and enjoyment. They accept what the Creator has intended for them. At the same time, spouses should know how to keep themselves within the limits of just moderation.
The spouses' union achieves the twofold end of marriage: the good of the spouses themselves and the transmission of life. These two meanings or values of marriage cannot be separated without altering the couple's spiritual life and compromising the goods of marriage and the future of the family.
The conjugal love of man and woman thus stands under the twofold obligation of fidelity and fecundity.
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