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What I can't figure out is how sexual pleasure derived from being on the receiving end of anal sex evolved. Is there an evolutionary benefit to taking it up the bum (applies to both men and women)? And how could something like that evolve from a simple mutation?

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For men its just about stimulating the prostate gland, which gives a much more powerful orgasm. You don't anal sex for that, but I guess it is one way. So obv pleasure seeking.

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According to wiki (search "anal orgasm"):
"Anal orgasm has nothing to do with the prostate orgasm, although the two are often confused.[18]"

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And I as I was browsing through wikipedia to check out my facts (I wisely decided not to use google for this one), I came across cited surveys that tell far from all gay men have anal intercourse. So there.

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I know that! I'm not saying gay men wouldn't exist without anal sex. I also recognize that some people would probably have anal sex even if it wasn't pleasurable for the receiver. It's just something I was curious about that has nothing to do with homosexuality, so I guess I went off topic.