Why sex has to be so much fun

In my message below, I talked about how reproductive functions take precedence over survival functions. This thought was triggered by the message below that, which noted that the clitoris has no survival function at all. It exists solely to make sex enjoyable. Of course, this is true about everything that makes sex enjoyable—for both men and women.

We have evolved to such an extent that lots of life is enjoyable. In fact, so much of life is so enjoyable that if sex were not as much fun as it is, we might not miss it. So here's a problem. Life is so enjoyable that it's primary function, to reproduce, might get lost in the shuffle. To avoid that, sex has to be even more enjoyable so that we don't forget about it.