I have found that a smile and a No go a long ways.. I've told them I am married, but because my husband and I are not attached at the hip (and he is hiding in the shade while I am in the sun) they always want to know where he is, and why would he leave a "beautiful angel" alone, that I need a Jamaican boyfriend who would never leave me alone, blah blah blah.. I usually just smile, and say, "he's always watching", then wave to my husband who waves back (because he really is always watching

) the boys will usually just give a thumbs up or shout something to my husband..
This past trip early on in the vacation I rebuffed a beach boy and he took it quite well, after that he would pass me every day and just say "Good morning my angel" or something along those lines.
It's all good..