I had to go into the "Alternative Version" section of the Wikipedia page for Robert Heinlein's "The Puppet Masters" to confirm that I did, in fact, read a version where the body controlling parasites that naturally reproduce asexually discover that sex with human bodies feels great and have massive public orgies.
the original publisher completely cut out a reference to the "puppet masters" later discovering human sexuality and embarking upon wild orgies, broadcast live on television in the areas under their control
The 1994 movie also leaves out the orgies. Pity we missed seeing Donald Sutherland "in action".
I also incorrectly remembered the parasites being native to Venus. While Mary was infected by one as a child on Venus, they are actually from Titan, moon of Saturn.
Obviously.
https://en.wikipedia.org/wiki/The_Puppet_Masters#Alternative_version

:EA DATA. SF:
