Mobile Love Hotel: Top-Secret Ecstasy (1978)

A small rental car company on the outskirts of the sub-metropolitan area. The female president of this company had a secret side business. They converted the back of a light van into a luxurious love hotel, and the male employees used the van to provide mobile sex services to frustrated women who were afraid of being seen having affairs or going out. Yes, it was a mobile love hotel, and it was a huge success.