Abnormal Confession: Give Me Hair (1989)

A man and a woman are entangled in a warehouse at a company. The man, Yuji, aims to cum inside her, but is met with resistance from the woman. The woman's bodily fluids spill onto one of the mannequins... Immediately afterwards, Yuji comes into the warehouse in place of the two men. Suddenly, a naked woman appears in front of him, wiping the cum from her body. Surprised, Yuji calls for someone to come in, only to find a mannequin lying around the warehouse...