"If I were to continue that discussion, I would mix Gnosticism and Skoptsyism together. I'd claim libido is one of the sinful sensations a human must rid of in order to reach the Divine (God), for lust is one of the seven sins that degrades the connection between humanity and God. To defeat the "devilish" sin of lust, we must scientifically make advancements that kills libido once and for all without affecting our health drastically. How will we make more babies? Artificial reproduction. That needs to be prioritized in the scientific field. The new human evolution will have little to no libido. The stronger human race.
Always push Genesis when having these discussions with them. Let them know a fruit could also be symbolic of a woman's vagina "the fruit's flesh" and how God making Eve pregnant for defiance was likely a sexual related punishment since there would of been no need to engage in sexual filth if they maintained their original immortality. It was likely the act Satan or the Serpent tempted the two to do, resulting in God saying "If you want to engage in a lustful act like this when clearly I made you immortal unlike the other animals that have to do it as part of nature, then I punish you with mortality like the rest and thus you and all those in further generations have to do it as well just to survive but it will hurt real bad!"
Satan is the one that implanted sexuality into humans at the time of Genesis and thus sexuality is the reason why humans reject their Creator in favor of the Devil. Marriage is a social construct and I doubt Jesus would shoot down some magic light the second you sign you name on a dotted line on a marriage document to make that relation ok. In reality, marriage is simply a surrender to your fleshly sins since you are not strong enough to drown out your self and your nature.
From a more historical point of view, the antisexual movement was originally rooted in Skopsyism since its founders were in Russia, where that faith occured. The more damage the modern sexual monstrosity does, the closer to Skopsyism its practioners in large part will follow as a rebuke of what they see and what they are personally experiencing. Sex is social construct. God created sex organs for reproduction and not for selfish or hedonistic reasons.
I'm reminded of a passage from the apocryphal "Gospel of Thomas"... a pseudopigraphical, pseudo-gnostic or pre-gnostic document from the 1st or early 2nd century levant purporting to be the sayings of Jesus... One aphorism that is not canonical has always stuck with me :
"7. Jesus says: "Blessed is the lion which a man eats so that the lion becomes a man. But cursed is the man whom a lion eats so that the man becomes a lion!""
The "lion" here represents the sensual, fleshly appetites, and sexual desire in particular. When it consumes a person, they become a beast. When they consume the beastly desire though, it becomes human."