Anna Maria Polani and Howard Ross (aka Renato Rossini) in MISSIONE SABBIE ROVENTI
This film was never dubbed in English so there's no official English title. It translates as MISSION HOT SANDS. I haven't seen it yet and it's pretty hard to come by. I believe this is one of the few films in which Howard was leading man (but since I haven't seen it I can't be certain of this).