This is a terrible argument, mostly because it allows for the persecution of minorities. "You're a filthy commie?!? Isn't that something you want to hide!?!"

This is a terrible argument, mostly because it allows for the persecution of minorities. "You're a filthy commie?!? Isn't that something you want to hide!?!" Freedom of speech (the human right, not the legal right) should allow you to have as many harebrained ideas as you'd like, and be as vocal as you'd like. You should be able to talk about your sex life, and you should be allowed to let other people watch you have sex (which you are, on both counts -- your friends examples kind of suck).