a question

why is it whenever i went to a nude beach with my ex, we sat in a quite spot, with no one close, to be nude, enjoy our own company, not be in anyones way (no throughfare). And within half an hour about 10 men have moved their position to within 10 yards of us , including some who sit right in front staring up inbetween her legs, on a 4 mile beach. when i go for a swim they would go and chat to the girlfriend. the question is are they mudists or pervs? discuss!!!