Ji FU quoted I Hate You—Don't Leave Me by Jerold J. Kreisman
"AM I LOSING MY MIND?"
People with Borderline Personality Disorder experience such violent and …
Countertransference refers to the therapist’s own emotional reactions to the patient, which are based less on realistic considerations than on the therapist’s past experiences and needs...He may even enter into a sexual relationship with the patient “to teach intimacy.”
— I Hate You—Don't Leave Me by Jerold J. Kreisman (Page 154)
From the chapter Seeking Therapy.
Oh this certainly doesn't make me want to seek out therapy. While I suspect it is far more common with female patients with male therapists, the idea that such a thing ever occurs is messed up.