This perception that it has value is one of the very things that people add just to complicate things. It isn't about value, or a chase, and to be honest I wish people would decouple it from anything more than intimacy. It should only be about getting you and your partner off. (And making babies, where wanted.)
For something that builds up inside all of us, some of us very quickly, society should really try to make it easier for everyone to access, especially since we are all equipped to provide.
Simply "sawing away" without emotion or "stakes", it loses value.
People don't just want to have sex, they want to have sex with some people, in some circumstances. Men are less picky (both out of necessity and due to lower consequences), but still somewhat selective, if for no other reasons then opportunity costs.
Nothing is simple about sex.
In terms of pure thrusting, that is a very narrow view of it. For one thing you're forgetting about sensuality, foreplay, kink, and polyamory, and the immense feeling of satisfaction of blowing off steam that builds up over time.
Everyone is equipped with the necessary hardware to work in my factory. Barring health issues it costs nothing. Why does your labor need to have "value"?
One can dream...
The truest line from Starship Troopers.