I agree with SevenOfEleven who said,

I personally would not want to see nudity on my commute.
People are crazy enough on the subway without the extra stimuli.

Quite true. 

Once upon a time, my daily commute included using the NYC subway
station at Grand Central Terminal on my way to lower Manhatan. 

One morning, as thre subway train arrived there were about 8 of us
queued up to enter -- I was the next-to-last and the guy behind me
]was very ... no, too close ... and no-one behind him to justify that. 

At the next stop, 14th st. or Union square, I got out to let others exit
and, as I backed up, I stepped on that same guy's foot
-- yes, he was behind me and that close, again. 

As we reentered the subway car, he was yelling about my rudness. 

I answered by saying that he was too close ... just as he had been
on the platform at 42nd street. 

He retorted that, "The people had been pushing him"

... and I responded that there was nobody behind him
... and that he should leave me out of his fantasies. 

Gotta love NYC ...

--
Martin

p.s. Ya' gotta' think quick, too!