"Why we go off sex"

Another fun article, this one about why sex gets tireder and less exciting as a relationship deepens.  This one ends with the paradoxical advice that, "To get back to the thrill of the early days, we need to learn the deepest and best lessons of breaking up, ideally without having to go through the very sad and painful process of actually doing so."  Or rather, it sounds paradoxical stated like that, but the case that the author makes isn't all that bad.

Here's the link: http://www.philosophersmail.com/relationships/why-we-go-off-sex-2/