According to a UK study from an un-named source despite much googling I can't find the origins of the study!!
The beaches are: Silver Strand in BarnaCo. GalwayCorballis in North Co. Dublin and Brittas Bay in Co.
Somebody is having somebody on!! For a start nude bathing is not legal in Ireland afaik.
It must have been a slow news day. Being naked in a public place is currently illegal in Ireland, but hundreds of people break the law every year by stripping off at the beach.
The police won't give you any hassle as long as you ranbirkapoornudepic in a responsible and considerate manner.