Blood Harvest (1987)

Girl with short brown hair and a slim frame is gagged and bound with rope in a rustic barn, a knife held to her neck by an off-screen attacker. The lighting is low, red-tinged, giving it that gritty home-invasion vibe. Cut to a young blonde in a kitchen by candlelight, sitting stiffly, steam rising from a kettle — she’s dressed, not doing anything sexual, just looking uneasy. There’s also an older grey-haired woman reading in a chair, overweight, wearing glasses, nothing sexual there either. And a teen brunette on a bed with stuffed animals, looking lost in thought. Zero sex acts in the frames described — just tense, eerie scenes with women in isolated settings. Doesn’t look like a standard porn scene so much as a horror-themed tease or intro.