Secret Love Life of the Invisible Man (1970)

Eliza Grant, blonde with long hair and a tight body, wears a white dress in the first scene like she’s going to a garden party. Hunny, the redhead in the blue jacket, looks like the type to sneak off for a quickie. That’s exactly what happens — the vibe shifts fast from innocent to dirty when the lab guy shows up with that device. You know, the one that makes things disappear? Well, clothes come off and so does visibility, but you still see everything that counts. The invisible guy is definitely inside Eliza from behind while Hunny rides another dude on the couch. Ass slaps, deep fucking, her tits bouncing — it’s all there. Camera stays wide during the doggy scenes so you don’t miss a thrust. The brunette in the white jacket shows up later, but she’s not part of the main action. More like a tease for another scene. The hallway and lab shots add a weird science vibe, but the real heat is in the living room where the threesome goes hard.