Where did sexual ethics originate from?

[Dystopia]

I think sexual morality has to do with religion, culture and society. I believe that the main purpose of sexual ethics was to (and still is) control the reproduction and decide how much and when we will pass down our genes to the next generation - Obviously you only need two heterosexual (of opposite gender) people to procreate and have children, so the natural result was to accept merely heterosexual monogamous couples. Also, since a lot of cultures and religions emphasized controlling our primary urges (because we are rational and capable of it) repressing your sexual needs was obvious at the least because otherwise you would rape people everytime you needed sex.

My view on sexuality is mixed - I'm not concerned with what people do in the bedroom, but I have no intention of seeing it in public regardless of how libertarian people are. I think sex is immoral if it consists in unjustified cheating, transmission of diseases, etc. Personally I prefer monogamy and fidelity because it suits my lifestyle best.

---

The thing is, sex can have very real consequences that one normally does not have from merely attending a concert or a movie.  Watching a movie can not, in itself, result in a pregnancy or the transmission of a venereal disease.  Those very real possibilities make sex something that should be done with greater care than watching a movie requires.

That obviously does not mean that one should pay any attention to religious nonsense about sex.  But it does mean that it isn't the same sort of thing as going to a concert or movie.

Nice straw man...

I'm not arguing that sex is "the same sort of thing as going to a concert or movie," nor am I attempting to argue that it is without consequence, but that it should have the same moral consequences. In plain words, idiotic fucktards should not be looking down on others based on their misbegotten beliefs about sex.

This is only true if I accept your personal, subjective idea of morality and ethics - And why should I do it? Some behaviours, sexual or not, are so self-destructive that I want to put an active stance against them. Just think of sex addiction - It's a more serious problem than many people think, and even though I'm not addicted I want to stop people from being addicted (and perhaps promote a less extreme cultural sexual desire).

I can look down on people for any reason I want whenever I want and against whoever I want - I can look down (and do) on people for their clothes, their haircut, their dialect, accent, skills, handshake, etc - We all do that and thinking sexual life is magically different is naive and promotes an impossible utopia.