aog, we have statute determining what is and what is not permitted in public at a national level. public displays of attention (pda's) are generally permitted, whilst indecent exposure isn't. sexual offences act 2003.
the matter for the level of acceptability of pda is dependent upon location and social determination. for example, two men holding hands and snogging iin public is perfectly acceptable, but standing in a bus queue and fiddling with your birds fanjita isn't. indecent exposure actualy does not outlaw people to walk around in the nuddy. it is only really when exposure is agressive or for offensive shock (as in the stereotypical old man in a raincoat) that it is.
i'll leave you to consider all the scenarios in your own inner turmoil. ofcourse they might think it and say it, but hopefully this would help explain why such a law is unlikely to be pased by or recognised by some splitter group.