Demoncrat7
Loftwing
However, it is considered a sin because it is not physically possible for two people of the same gender to procreate through sexual intimacy.
Cough.
So, all of the infertile women in the world cannot have sex with their husbands. Women who have reached menopause can no longer have sex with their husbands. Men who are infertile cannot have sex with their wives.
I highly doubt that your religion proposes these things
Sexuality and intimacy have functions beyond reproductions. The female orgasm, for example, has no direct reproductive benefit. It does serve, however, to release a whole buncha bonding hormones so that she and her partner feel nice and secure together to raise their kids.
So, sexuality serves a purpose much larger than just popping out babies. It creates family and intimacy between two people in a way that just spending time together can't.
An awesome article on the topic:
http://www.oxytocin.org/oxytoc/love-science.html