It's entirely possible to get away with fucking with someone else's body. Rights are preferences. They're nothing real, just a man made concept. You take humans out of the world and rights stop existing.
Not that I'm against rights, they are a handy concept. But libertarian-minded people have this weird, absurd need to make rights into something they're not.
They're like God for atheist people. Rights are the imaginary friend of the atheist.