Will our heroes be able to find their friend who has mysteriously disappeared in africa? (1968)

A rich businessman is fed up with work, family, society, and goes with his accountant to Africa, in search of his brother-in-law who had vanished there in mysterious circumstances. They will find him alright - as a tribal chief, surrounded with lots of topless, shapely wives. They are going to return to civilisation, but will their friend come with them?