Taboo (1980) Film Overview
If you are looking to view or download the film legally, you can find it through the following types of platforms: Adult Cinema Archives: Sites like IAFD (Internet Adult Film Database)
Star Performance: The film made Kay Parker an industry icon; she initially turned down the role due to the controversial theme but eventually agreed to bring a sense of "class" to the production.
Taboo is technically still under copyright. While the original distributor (VCX) has changed hands several times, the rights are currently managed by various adult nostalgia labels. Downloading a torrent or a ripped MP4 from a cyberlocker is copyright infringement, regardless of the film's age. It is not "public domain" just because it is old.