Having all of your sex come from porn is like having all of your meals come from McDonald's. And that's a choice you can make. It's probably not the best choice, but a fair number of people do in fact make it.
Because stringing along some poor soul that looks for actual relationship and let her waste months to figure out this relationship was never going to happen sux.
You can construct your family in a lot of different ways. Having a lot of friends, some very close friends, and zero lovers is a perfectly valid one.
At least, it was becoming such. Legally, there is more and more push back against structures other than one male and one female, who are each other's sole and perpetual means of support.
I understand that everyone has different desires, but it is hard for me to, personally, empathize with. Hence the mind boggling.
The dating world is incredibly messed up right now.
Some people have decided that they don't need a relationship to be happy. They've found other ways to cope. For some this may be sour grapes. But that's another coping mechanism in itself!