Yeah, I would argue that yielding to the impulse to 'procreate constantly' outside of marriage would be equally as harmful as following any other sexual desires (homosexuality, polygamy, pedophilia, etc) that doesn't line up with how sex and marriage are meant to work - that is one man marrying one woman and them having sex.
"Meant to work" is very strange here. First monogamy it supposed to be a natural state. Now its an artificial social construction? Then what's so precious about it? Versus the other states that people are, and have been, living in for centuries?
Oh I get it - argue whatever it takes to make male-female marriage sacred and anything else wrong. Ok. I see.
I can see how 'meant to work' would sound strange, especially since we normally talk about sex as something that should be based solely on our individual physical urges - whatever they may be.
I would say that marriage and sex get their value and purpose from God. That he created man and woman to come together in marriage and have sex. That he made sex pleasurable, and good, and that one of the benefits of sex is often that children are produced.
I think we must either get our understanding of sex and marriage from a source outside ourselves (the transcendent God) or we just make things up to suit our individual drives - and the second option opens us up as individuals, and as a society, to a lot of harm.
I understand this is not a popular viewpoint, especially on HN, but I think it's valuable to offer some pushback in a civil way every now and then.