Well, yes, but that's just a bonus on the side and a one off. Your main income is passive, not earned in the battle itself so you can afford some slow days.
A single good orgy gives like 10 trillions
![Pogchamp :PogChamp: :PogChamp:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Or whatever T means, I didn't count those insane nubers.
Yes, you need to retreat while girls are still surrounded for that to give EE. It won't be a retreat otherwise, isn't it? Not that useful of ability. At the stage when EE matter, every single surround turn count so you don't want to waste them. And when you can give up like 30 turns worth of surrond you're making like 100-150 EE per turn and don't care about 6 extra EE.