Grunt: Goons with probes inserted in their pleasure centers; wired up so when they kill someone, they get paroxysms of ecstasy. In essence, customized serial killers. Easy to kill, and they tote shotgun shells. It's like a little Christmas each time you blow a Grunt away!
This was a literal weapon in the Ringworld novel series. A gun that could cause an orgasm in someone remotely. Used to pacify people.
They also had the brain implant to the pleasure center that literally killed addicts who never turned it off and starved
From QUAKE (1996) instruction manual:
Grunt: Goons with probes inserted in their pleasure centers; wired up so when they kill someone, they get paroxysms of ecstasy. In essence, customized serial killers. Easy to kill, and they tote shotgun shells. It's like a little Christmas each time you blow a Grunt away!
There was a big machine in Barbarella that was meant to orgasm her to death.