Decadence (1994)

Two couples betray the decadence which lurks beneath the surface of high society: Steve (Steven Berkoff), wealthy but ignorant, is engaged in a kinky relationship with Helen (Dame Joan Collins), a posh socialite living in Belgravia; meanwhile, Steve's nouveau riche wife Sybil (Dame Joan Collins) is having an affair with Les (Steven Berkoff), a private eye hired to kill her husband.