A group of adventurers head to a primitive tribe in Africa to find a treasure of diamonds and a beautiful white girl who was lost years ago and was made the tribe's goddess.
Diana, along with her godfather, is adopted by a tribe of Africans after their plane crashes in the deep jungle. They threat her as a goddess and make her drunkard godfather their "Big White Chief". The plot begins when some mercenaries looking for the titular diamonds stumble across the barely-legal white jungle girl. Along with Diana's much older cousin and his wife, they come looking for her in the jungle. When not arguing eternally over where they should cross the river, the expedition develop alternate clandestine plans, including bringing back Diana but stealing the diamonds, not bringing back Diana and stealing the diamonds, murdering Diana and stealing diamonds, marrying Diana and bringing her back with the diamonds, marrying Diana but not bringing her back (forgetting the diamonds), and a few others. Just about everyone dies in the process of figuring this out, sometimes in the nude.
Diana's old cousin and his wife start an expedition along with some mercenaries to find her in the jungle. At 26:10, the wife comes inside one of the mercenaries' quarters and makes a proposition to him regarding what to do with Diana once they've found her. She then has sex with him to sweeten the deal.
At 41:29, the wife nearly gets eaten by a crocodile while swimming naked in a river. She comes off the water and runs to the arms of the mercenary she banged earlier instead of her husband's. Her husband scolds her for prancing around naked and he comes back to their tent. Meanwhile, she comes with the mercenary to a secluded area in the woods and fucks him for the second time.