The Beat Generation.

In the opening scene, a "beatnik" named Stan Hess (Ray Danton) sits at a table in a coffee house with a woman who begs him for his affection. We learn that Hess is a serial rapist at large in Los Angeles. His modus operandi is to gain entry to the home of a married woman whose husband is away by pretending to be there to repay money loaned by the husband. Once inside, he feigns a headache, pulls out a tin of aspirin, and asks the woman for water. While she is distracted by this errand, he sneaks up behinds her,