Is long term monogamy unnatural for human beings?

[Amarok]

I think the point was that monogamy (life long loyalty to one person) is contrary to our animalistic instincts, but as humans, we have the capacity to strive beyond purely instinctive, animal urges, for something greater. He put it into more words than that, but thats the gist of it.

Anyway, in that sense I would say it is unnatural.

Nope all this is false

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LOL?  What point?  To say I'm not "biologically suited" to monogamy is to ignore everything about me.  It starts there, and just gets worse, asserting magic in place of the obvious.  

-Biologically, I'm massive, intelligent,  fiercely loyal, and deeply committed.  It's who I am.  Who I've always been.  It didn't even need to be taught  my most instructive lessons have been those times when who I am has lead to misery..my own or others, lol.  If I were a betting man, it's the explanation for why I've never been single.  Why I'm a serial monogamist with five kids and more trouble brushing off the ladies than anything else.  Why I'm still convinced my every ex was a wonderful person and mommy material.

The author did not say we are not "biologically suited" for monogamy. That's what the professor said that he was arguing with. The author's argument is that we are suited for it because we are rational beings.

That assumes poly are irrational. And that monogamy is by default more rational.