A couple has a very open marriage allowing for both of them to enjoy sex with additional partners, but seemingly only women. Professor Rasputin, the husband, really loves to find hot young women and have sex with them and his wife in threesome fashion. Eventually, him and the wife turn their lovemaking into a business where the Prof poses as a sex doctor with the wife as his assistant. However things turn dark when we find out the Prof likes to get kind of rapey with some of his female conquests, and murder them too! And it seems his wife might be am accessory to these grisly crimes!