I think some of your examples are poor. Managers and co-workers can hook up if they are consenting. Yes the manager has power over them, but especially in a big company that power isn't majorly significant. Its also possible the underling is sleeping with the manager consentually for their own benefit and gain. Power dynamics can be bad but are not inherently rape.
Now that manager starts using raises, prefered shifts or whatever else to gain sex, thats a different story.
For inedbriation like if we are both super high, first time is questionable, but sexual partners that have been together for years and get high every day? Probably okay in most scenarios.