> Sexual activity among people in the same workplace isn't exactly uncommon.

But often prohibited during work, and when not generally not a job requirement, and when it is a requirement of a (legal) job, there's also a whole lot of intrusive requirements that would generally be considered peivacy violations in other work.

Breathing the same air as coworkers, though, is a practical requirement of in-office jobs, not something that might occasionally occur as an extracurricular activity during working hours despite being generally prohibited by policy or, if not, outside of requirements.

Outside of a narrow range of work - with existing STD testing regimens - people aren't supposed to have sex at the office. They are required to breathe, however.

Do see now how requiring a vaccine because it would mitigate disease transmission risk in real world scenario that's a requirement of in person work is reasonable, vs requiring it because two people might sneak off to the head to get the leg over?