No, I don’t. The bigger issue is HR (or anyone with firing power) trying to police who has sex with who.
That's your opinion but not the opinion of the federal government. They make the rules and you have to follow them, whether you like it or not.
I’m arguing a moral point, not a legal one.
Regardless, there is no federal law that bans relationships between bosses and subordinates, and no law that requires companies to police them.
And a law banning companies from retaliating against people for romantic relationships would not go against any current written law.
That's not an issue at all. It's literally part of their job.
Even so, HR didn't do this.
Don't complain if you get passed over for a promotion in favor of someone who's sleeping with a higher-up.