How to learn to enjoy sex

For most people reading this blog, this is going to be an irrelevant question. But I was reminded today that it's a serious problem for some people whose bodies and minds have never quite gotten synched up to experience sex as something pleasurable.

The most common causes of 'sexual anhedonia' (lack of pleasure) are drugs and medications, hormonal problems, depression, dysthymia (a form of chronic depression), and religious repression. These require major lifestyle changes and/or serious medical or psychological treatment.

But what about the mysterious cases of anhedonia that don't seem to be related to any of these causes?