An adaptation of five stories from the anthology Der schwarze Dekameron: Belege und Aktenstücke über Liebe, Witz und Heldentum in Innerafrika (1910) by ethnologist Leo Frobenius with a short final vignette, The Black Decameron is essentially a cross between Decamerotici films of the early commedia sexy all'italiana genre and Mondo films in featuring gratuitous pseudo-ethnographic nudity.

Guarigione di una pazza per gli uomini (Healing of a Woman Crazy for Men): A man is married to a nymphomaniac and asks for his friend's help to solve this problem.

Gli amanti puniti (The Punished Lovers): A fisherman suspects that his wife Adu is cheating on him and pretends to be blind to learn the truth.

Che cosa non ha fatto (What He Did Not Do): Handsome and "well-endowed" Simoa gets drunk on too much toddy and wears women's clothes.

He soon contemplates that his drag may also bring some advantages and arrives at the house of a village judge to be his "new wife" but ends up sleeping with all the women of the household.