Good point. It's the attitude towards sex that is inane. Sex isn't bad. Unhealthy sex is bad. Why are we mentioning sex in the same sentences as violence in the first place if we haven't been conditioned into thinking sex is bad? It is simply more irrational, religious dogma.
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I think you're right that much of society's irrational attitude to sex comes from religious tradition. But I think there is more to it than that. Sexuality is such an intimate part of ourselves that it doesn't take much for us to feel threatened.
For example, how many of us would be comfortable talking to their husband/wife/lover about
all their sexual fantasies without any form of censorship? It's one thing to expose your own fantasies... It's another to be exposed to another's fantasies. Do you really want to know
all the things that go on in your lover's mind? If my girlfriend had thoughts about doing it with that nice guy from her job, do I really want to know about it?
When it comes to sex, we are easily confronted to feelings of jealousy, insecurity, lust, envy, frustration etc. While I don't agree with all of Freud's theories, I think he was right in pointing out how much sex is a crucial part of our psyche. If sex is not embraced, it easily becomes scary. And the sexuality of others, especially of our own lovers can easily become scary if we are not ready to be truly honest with ourselves.
I think it is because sex can trigger so many uncomfortable feelings, (and incredibly beautiful ones too), that we make a big deal of how it is presented in the media...