Why Does Your Husband Deceive You? (1969)

Eduardo, a man about to get married to his lifelong sweetheart, begins having second thoughts about the step he is going to take. His future wife is not one-of-a-kind and, among the wedding guests, there are several women he would not mind spending the rest of his days with. So, while the ceremony carries on, he fantasizes about the lifestyle he could experience with some of them.