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As others have said, I think it comes down to exposure in terms of removing the "ick" factor. A lot of things in the past were likely misunderstood and part of a more hidden/secretive community. So the simple lack of knowledge led people to believe it was odd, unusual, unhealthy, whatever. However with all the sexual information available today, so many more people are open to trying things because they're able to see it in a light other than "the unknown" or what have you.
However, I think there's a big difference between an increase in anal sex for example and the issues you brought up such as beastiality, scat, etc. That difference being health, physical and emotional. There is nothing wrong with anal sex, BDSM, etc, it's a person's choice whether they want to engage in those activities, but in most cases they are not harmful. Whereas bestiality, scat, etc are definently harmful to a person's body and mind.
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"The world is so exquisite with so much love and moral depth, that there is no reason to deceive ourselves with pretty stories for which there’s little good evidence. Far better it seems to me, in our vulnerability, is to look death in the eye and to be grateful every day for the brief but magnificent opportunity that life provides"
-Carl Sagan
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