Theory

Consistently good sex is rooted in a relationship that contains a measure of conflict and contradiction, something with crests and troughs as opposed to one that is placid and smooth-sailing and always genial. It is to be found between two people who drive each other crazy, and not always in a good way. It thrives when two people have differences of opinion as well as just plain differences. And one of life's greatest ironies is that a relationship that is 100% pure mutual admiration, respect and caring seems to make for sex that's kind of boring.

Of course, that's just a theory.