The Entity (1981)

Synopsis
Another "true story" of dubious authenticity, The Entity concerns a libidinous invisible presence. This unseen force repeatedly rapes poor Barbara Hershey, who can't get anyone to believe her stories of sexual assault. Frankly, she doesn't believe them herself until she undergoes therapy conducted by experts in both psychology and the supernatural. The entity, a great, hairy blob, is ultimately tricked into materializing, an act of revelation that proves to be its downfall. The Entity was adapted by Frank de Felitta from his own novel. ~ Hal Erickson, All Movie Guide