Thank you! That's a fair point. I'll work on adding a tutorial to the game to explain how things work.
Willpower = HP
Arousal = Stagger
When a unit's Stagger bar reaches 100% they orgasm and become Sensitive for 2 rounds (including current round). While sensitive, all Arousal damage taken is converted into Willpower damage.
So basically we need to build up their Blue bar and try to burst damage them while they're vulnerable. "Horny" debuff applied by Daring Display (and other sources) increases Arousal damage taken by 25%.
All the icons have tooltips so if you click/tap on one you'll get a description, but it is a lot so you're absolutely right a tutorial would go a long way. I'll add it to my plans for the first update, thank you for your feedback I really do appreciate it!