"Shivers" (1975) aka "They came from within" -
WombWithAView - 10-20-2020
This is a Cronenberg film about man made Parasites infecting an Apartment building. It makes people into compulsive sexual and violent deviants.
There is one scene of an infected man coaxing his Parasite to kick inside his Belly as he talks to it. It moves around in his belly briefly as he reacts to it.