That is a wild false dichotomy, to assume that the alternative to buying custom adult content would be to have a baby. Plenty of people don't want babies, don't feel like they're in a financial situation to support kids, don't want a relationship, etc.
It's decoupling what shouldn't be decoupled in order to optimize what shouldn't be optimized.
Rather like how your employer's janitors are from a service company, your uber driver is an independent contractor or whatever, your mortgage has probably been resold like five times, etc.
All examples of having more complex interactions stripped out.
What are you talking about, what is being "optimized"?
People can do stuff for fun, because it feels good, or for whatever reason. Not everything in someone's life has to be done for a direct survival goal. People go for runs because they want to be fit or achieve personal goals, (probably) not because they want to be better at outrunning a boar that they're hunting.
Degeneracy is about loss of expected complexity, yes? All your atoms are smooshed together into a uniform soup, all your call-center people have to follow an identical script, etc. Taking something that originated itself as a way to ensure continuation of the species and splitting out the fun parts from the continuation parts seems like the sort of thing that ought to count. And yes gyms probably should count as well, except nobody cares about that.
What makes adult content "degeneracy"?