Earlier quoted context omitted.
I think where the ship runs aground is that sexual things are treated as intrinsically amoral, because people feel its amoral. However, that feeling is no more legitimate than "green is the best color" (because my brain tells me it's the best). Edit: Just want to add - Homosexuality has the same illogical hurdle. It feels immoral to many people, so therefore it must be immoral. People are largely unable to separate t…
Because free sex makes disease and unwanted children, disease and unwanted children cause/suffer-from problems, disease and problems hurt society. This isn't just moral puritanism, it's for good. Promiscuous sex and many partners irreversibly negatively influences a person's pair-bonding ability at a chemical level, this destroys the family unit and does not benefit the empowered singles and divorced 'pair-couples' w…
The second paragraph is pseudoscientific bullshit that gets parrotted by conservatives. People have been and will continue to have casual sex, and society is, and will be doing fine.
Your last sentence reveals the real reason you're against casual sex.