Wikipedia:Sex Medusa

Sex Medusa is a Hong Kong horror movie shot in 1999 and released direct-to-video in 2001. It was directed by Tommy Law and produced by Jacky Tang.

Plot
While conducting secret biological research in an underground sewage system, a team of scientists discovers a nest of alien-looking eggs. They destroy the nest, but fail to notice that one of the eggs has already hatched. The hatchling, an adaptable reptilian creature, soon was adopts the form of a beautiful lady that begins to integrate itself in the human society, searching for sustenance and a means to fertilize her own eggs.

Cast

 * Carrie Ng Ka-Lai
 * Nomoto Miho
 * Vincent Wan Yeung-Ming
 * Elvis Tsui Kam-Kong
 * William Leung Chi-Ming
 * Leung Wing-Yim
 * Kai Cheung-Lung
 * Hui Pik-Kei
 * Chan Tsung
 * David Lai Wai-Ming