Dark chocolate is wonderful. All real chocolate contains chemical mood enhancers, the darker the better (or bitter) in my book. I will often eat Lindt 100% when i can get it.
It can also be an aphrodisiac, though it's more the sensual feel as it melts in your mouth that gives that effect.
I love dark chocolate, but 100% is too bitter for me. The best I tried was between 80% and 85%. Do you know Hasnaa ( https://hasnaa-chocolats.fr)? She's my favorite.