Movie on the end of a VHS tape

this movie starts with Vietnam footage and moves to a scene where a man and woman are in a kitchen, he is talking about how he raped kids in the Vietnam war, and it is all in the past now. His wife/girlfriend then pulls out a gun and shoots him, when he lands on the floor, she gets out a knife and castrates him. This film had the title of the movie missing because it was taped over with another movie. Made before 2000 , 90s possibly 80s