Masturbation is normal, healthy and there is absolutely nothing wrong with it according to the vast majority of doctors, scientists and psychiatrists. I would be far more concerned about anyone who claims they’ve never masturbated. If you are in a relationship and you don’t feel the need - good for you. Not everyone is in that same boat.
No Man’s Sky works great on Linux Mint. I’ve been playing it for a few years via Steam with Proton. Runs flawlessly on my system. Definitely worth checking out proton.db to see if there are any tweaks you may need to make, though. Enjoy! It’s a fantastic game!