Agreed, IMO, to believe otherwise would negate the premise of self ownership. In other words, if one starts with the premise that we own our bodies (which seems self evident), then it follows that only we can choose what we do with it. For others to place these restrictions puts some sort of claim of ownership over our bodies, which runs contrary to our conscious experiences. (it also follows that anything produced by the fruits of our bodies is entirely our own too, but that’s off subject) :)
Of course some do reject the premise that we own our own bodies. Some claim that God owns us, since he created us.
At such an axiomatic level, I suppose it would be hard to make headway.