Alumna masturba a su profesor
Of course it isn't. We all have sovereign civil rights over our own persons. Those rights end at the point where others begin, ie, their persons. We cannot impact on or impede another person's self and their own personal rights because they have rights too. Meaning that we do NOT have the right of power or control or harm or anything else that affects another person. It is not a contradiction but an exception. It is a universal boundary on how our rights are exerciseable. That's how the system is presently designed to function and really should be universally evident.