Blackdragon provides a good explanation why sex is so important to men:
Unless you’re engaged in regular martial arts / MMA, are active military in a war zone, or some kind of extreme thrillseeker (regularly doing things like skydiving, base jumping, sport climbing, etc) then you really have no other way of tapping into this core masculinity other than having sex. Yes, you can watch action movies or play violent video games, and those are all great, but it’s not the same thing.
That’s how important sex is. That’s why it’s important to let it all go and turn into a monster during sex. When you’re done having sex, go back to your normal, rational self. (I do.) But during sex, don’t worry about any of that. Sex is a gift… one of the last ones we have of its kind.
King Solomon understood the importance of this masculine ritual:
may her breasts satisfy you always, may you ever be intoxicated with her love. (Prov. 5:19)
The key word there is “intoxicated.” In Hebrew it literally means to go astray and act without knowledge. Normally, it is used in the context of commiting a sin without being aware of what you are doing… such as when you’re drunk.
When you realize that it is your wife’s body that is supposed to cause this irrational masculine behavior, combined with a woman’s natural inclination towards “rape fantasies”… you start to get the idea that God meant sex to be a little more wild than we give Him credit for.