The truth is that it's much more complicated than people want it to be, and we think that's really pretty wonderful. We wouldn't care that it all tasted the same, and we'd never crave any one particular food or another. We would all like to eat the exact same kinds of things, and we'd all be perfectly happy with that all the time. If our bodies all operated identically, we would all need exactly the same diet and nutrients, get hungry at the same times, and like and dislike the same foods. In fact, if someone told you it was supposed to be that way, you'd think the idea was pretty ridiculous.
Sex is pretty much the same way.
We are all different. There are certain physical, hormonal and psychological mechanics that come into play for the majority of people, and understanding those is what we all need to lay the foundation for understanding how sex works for ourselves and for our partners. Once we understand how our bodies work when it comes to sexual response, we've won half the battle of learning how to enjoy that and incorporate it as a healthy part of our lives, both alone and with others. Our sexual appetites, impulses, and responses aren't out of our understanding or control. Sex is something we have to learn on our own by understanding ourselves and our bodies.