There's another, underlying philosophical reason as well. They both are about coercing public acceptance of "My right to do what I want to with my body, no matter how destructive." The view of the body as a big Mister Potato Head, the features of which can be added, scrambled around, or discarded at will.
And peeling back yet another layer of the onion, you have their rejection of life, the continuation of life to another generation, and of the natural sources of life.
You'll notice that any movement that calls itself "sex-positive" is "positive" about any kind of sexual jigger-pokery --- any kink, any fetish, any time, with anyone, anything --- EXCEPT for procreative, marital, conjugal intercourse.
That last one is considered an Earth-Threatening Social Problem Urgently Requiring a Solution.
I knew it was you because of the combination of rustic dialect and the Unabridged Dictionary.