 Then followed his Nazi-themed exploitation films such as "SS Girls" and "KZ9 Lager di Sterminio", some mondo documentary films starring Laura Gemser, "Le Notti Porno nel Mondo" and "Emanuelle le Porno Notti del Mondo N. 2", and nunsploitation films such as "The True Story of the Nun of Monza" and "The Other Hell" .Mattei continued working in various other exploitation-themed genres in the 1980s such as zombie films, sex films, peplums, and Vietnam War-themed productions.In 1982, Mattei filmed two "women in prison" films, "Women's Prison Massacre" and "Violence in a Women's Prison".