If It's Tuesday, This Must Be Belgium (1969)

The ebullient and seductive Charlie Cartwright (Ian McShane) is a tour guide taking a busload of American tourists across Europe. The group of travelers includes a World War II veteran, a wife and her cynical husband (Murray Hamilton), young lovers, an Italian-American meeting his relatives for the first time, and Samantha Perkins (Suzanne Pleshette), the beautiful but old-fashioned department store buyer traveling on her own, whom the womanizing Cartwright inevitably falls for.