I have only one non-sexual is it possible to edit it in saves/variables/globals etc or more, or should i invest in endurance?

Apply the built-in Constants mod. Then click the new Constants button in main menu and modify the value for basenonsexactions. New value will take effect on next day in-game.

Alternatively, skip the mod and just edit the value in scripts/variables.gd 

Oh you are right. Thanks so much!