I personally see nothing wrong with what they are doing. They
are not harming or hurting anyone or anything what, just walking
around in their birthday suit will not have any detrimental effect
on the economic system or instability of the political system.
What they are doing is supposedly wrong only because people
think it should be immoral, without questioning why it should be
wrong.
Just because some people cannot accept such behaviour base on
their own mindset does not warrant an arrest for the couple i
suppose.
In fact, I think the couples should be complimented for having
the courage to go against what's acceptable socially (without
harming anybody, of course)
I'm not saying that they're stupid, but they took the risk,
knowing that it's against the law (you can't walk around in the
buff in your own house and accuse the whistleblower of voyeurism)
and that there are people who won't close an eye to even a
cardboard elephant cut-out (but will happily film a gangfight).