This is a movie probably from the 80s, maybe early 90s.
A woman has 2 lives. In one, she is well behaved. The other, a second personality, is wild, violent and cruel.
In one scene, she is caught by another woman while torturing a man in a sado-maso situation.
i know this wont help you…but this is still on my “mission” list from when you posted it 50 years ago…one day we hope to find it 😛