Originally Posted by AutumnalTone
There was nothing obvious about the histories of these two people, either. I imagine you've met folks who are strictly monogamous and simply have no idea as to whether they are or not. Just because you can't conceive of it doesn't mean it doesn't happen.
I can conceive of it, but I want to understand it on a deeper level. I think I can safely assume that all human bodies work in the same basic ways. So if someone is not attractive to anyone besides their partner, the question is what do they do with the information about another person that is potentially appealing to them.