Not survival, sanity. Imagine being a horny teenager with no hands!!!! You wouldn't be able to fap, or tie a noose to escape the inability to fap, or even pull a trigger. Or open a pill bottle. You could get a fake rubber girlfriend, but once it got crusty, you wouldn't have hands to clean it with. It would be hell on earth!!!!
Or imagine not having porn, and having to fap to nothing, and it would take forever, and you would have 1 arm way bigger than the other, and risk chafing, and more time to risk getting caught in the act. !!!!!. Porn is essential to our sanity.
Imagine getting dumped and being depressed, and not having any porn to cheer you up, suicide rates would skyrocket!!!!