Whether of not the mainstream Nicholas Roeg film Bad Timing, A Sensual Obsession was the literal inspiration for Another Secret shall remain a mystery, however they do share some telling similarities.
Both features revolve around psychiatrists (Dough, in this case) who have relationships with prostitutes, and the escalating mind games they play on each other.
Taking the idea a step further, Another Secret casts Ashley Dunn as both hooker and wife to the doctor. The couple share their patients/clients in a most unnatural way, and to her credit Dunn is a better psychiatrist than her husband. She handles Peter north and Patricia Kennedy quite professionally, but like real lie psychology, this story has no real ending.