When I went to the dead sea scrolls exhibit, I learned that the tribe who wrote the dead sea scrolls did so at a commune where they had retreated from society because of society's moral decline.

This was 2 millinea ago.

People have sex- in every way their bodies allow.

People get drunk, stoned, whatever to relieve stress. Hell, even bears do it.

And yet people still honor their debts, help people with broken down cars, mostly only lie without malicious intent, etc.

Some small number of people can't handle sex, drugs, video games, exercize, hand washing, etc. etc. etc. We can't keep prohibitting these activities to the rest of society.

In the case of drugs, illegal drugs are resulting in the destruction of moral behavior for millions of people. If drugs were legal, the money would go into moral parts of society instead. Thugs would stop killing policemen and judges and corrupting them.

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On your other subjects- I mostly agree except for the prostitution thing. So many girlfriends are really only 1% removed from hookers (i.e. they stay with the guy because he has money, takes them places, and gives them money-- but it's a "relationship" so it's okay-- so really prostitution is legal if you are rich, but not if you are middle class or poor). It would need restrictions around it but if it's legal to have sex (which it is) and it's legal to make money (which it is) then making money by having sex should be legal (which it is in many ways already).