WOW!! I would not minding trading places with this guy for the afternoon as this lady is really going to it and really seems to enjoy the action here. Of course, it is nice to see mutual satisfaction on both parts!
There should be many more beaches like this one, where sex is regarded as a natural, pleasurable thing, along with swimming, sun-bathing, picnic, etc; signs saying 'nude beach' should imply that this is where any such activity, provided nobody is offended, is acceptable.
at the beach;-)