I was raised on the idea that the union between a man and a woman was something sacred and beautiful. Since my upbringing, I have learned there are two other general ways people are taught to think about sex. Well - sort of three. There is a sort of inversion of what I was taught - a use of the influence of sex (and sex drive) on the mind/body to coerce and subvert a person. A simple example is the "you like it" idea. A person can be forced to orgasm and their body will experience pleasure even while their mind is completely rejecting the experience. The reality is that people desire pleasure and thrill to an extent - and the contrast between the physical and mental sensations begs explanations. For which one is provided "you are just a dirty slut." Someone particularly inexperienced may actually begin to believe that there is something different about their core being.
Rather than using sex constructively to affirm love and companionship and to create new life - it is used to destroy a person's concept of self and sabotage their character. Or try to, at least. A soul is much harder to destroy than that.
The second other way is to just view it as monkeys doing monkey things. A sort of hedonistic view of animals seeking pleasure. I find that people can rarely avoid seeking one of the two prior ideas as we are fundamentally more than animals - so this is usually a thin veil.
A variation on this is a kind of hedonistocracy idea where one's worth is measured by sexual exploits. It's not strictly an inverted ideology from my own as it doesn't inherently seek to destroy anyone, but it does pursue sex as a sort of conquest objective. A sort of hypergamy where the goal is power but power is measured in sex.