sometimes it is said, in an argument against something (for example: certain foods, sexual acts, piercings, the use of condoms even), that "it isn't natural."

is that a resonable argument? what does "natural" really mean, anyway?

could be "that which comes from or is found in nature", or majority (which I would consider "natural order").

EVERYTHING is natural in the first sense.

NOTHING is natural in the second sense, because the "majority man" does not exist, or rather, is an illusion, too elusive to ever be real.

I don't know...what do you consider "natural"?