I remember watching an American (I believe) movie in the 1970s about aliens coming to Earth and psychically causing mass suicides. The movie may have been made in the late 60s or early 70s as I watched it on TV in 70s. (On channel 50 in Detroit, if that helps.)
I don't remember any of the actors, as I was fairly young when I watched it.
I believe the main action was set in New York City, or some other large city. I don't think the aliens landed on Earth, but they did sometimes abduct people. I remember a scene where an elderly man has been abducted and is returned to Earth where he's questioned about what happened. He tells them that he met an attractive young woman and implies that they had sex. (I have a vague memory of them showing some of their interactions, and the woman being a tall white woman with very long black hair in a tight pony tail.)
Throughout the movie, people all over are committing suicide for what seems like no reason (if I recall correctly). That's most of what I remember.