The Desperate Mission (1969)

The main villian is a womanizer. At the beginning of the film, he and his girlfriend are briefly seen kissing while having a roll in the hay. We later see him hitting on a married woman. The woman doesn't love him, but she lets him spend the night with her on a campground. He lays on top of her as the embrace and kiss. The woman's cleavage is shown and her breasts are inflating rapidly as she breaths rapidly.