Low mind triggers ahegao state. Mind restoring depends on stamina. You can lower the stamina with multiple climaxes and longer edging - it's kinda minigame.
Ohh okay. Tbh I thought the stamina bar would influence orgasm sensitivity. For example, when the stamina bar is lower, the easier it would be to make the girl orgasm (or potentially even orgasm without stimulation accidentally from too much edging).