Still fairly busy today so just time for a brief reply:
musiclover wrote:
For example, there's presumably a relevant difference between using one's leg as support for a table vs. using contraception - the difference supposedly being that the former involves using X for a function other than its natural function, while the latter involves using X for a function opposed to its natural function.
It's a small (or seemingly so, anyway) point, but we're better off talking about the natural ends of faculties than about the natural functions of (faculties or organs, we don't care which).
In those terms, your question is about the difference between (a) temporarily using an organ that is ordinarily used in the exercise of the faculty of locomotion, for another purpose and in a way that doesn't reduce its usefulness for locomotion, and (b) temporarily using one's reproductive faculty in a way that deliberately and positively frustrates its (obviously natural) end of reproduction.
Put that way, I hope, the question all but answers itself.
Last edited by Scott (7/14/2015 12:55 pm)