You are mixing up two different definitions of "right". One is a legal term about what you are allowed to do or what can be done to you. That's what gp meant. And I agree that the only rights you have in that sense are ultimately those you are willing to fight and die for. If it can just be taken away it's not meaningfully fundamental, unalienable, or universal as a legal right.
The definition you used is about what's morally right and in that sense talking about fundamental rights that can't be taken away if you want to hold up some definition of human dignity makes sense, but even then it's subjective to some degree and depends on which school of thought you subscribe to.
Your example shows exactly this ditchomy. If freedom can be taken away and sexual consent ignored, those things can't be at fundamental or real as physical laws. But even so I have a hard time imagining most who see it this way would consider this as anything but reprehensible.
