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 nudists or pervs?
discuss!!!