Sex, in addition to being the method by which we procreate and so survive as a species, can be a source of great human pleasure and intimacy with another.

But this relentless attempt to reduce sex to some sort of index - who has more, who wants more, how horrible if you don't have enough or don't feel like it - mechanizes  sexual behaviour, does NOT promote intimacy and affection, and encourages endless angst (and often unhealthy behaviour) for everyone from the 12 year-olds (amongst themselves of course) to the 80 year olds.  Articles like this don't help either.