I can add a thought or two about "beach flop." Unlike (it seems) many on this board who show-off in their everday life, I keep my long hose fairly well strapped in. However on our recent vacation at Cap d' Agde, France, the mega-nudist resort 50 miles southwest of Montpellier, I really got an opportunity to do The Beach Flop (sounds like a retro-disco tune.)
We had to negotiate about a mile of beach between our apartment in Heliopolis and our favorite spot in front of the dunes, with the other couples, and away from the squealing kids and families. With the relaxed atmosphere, temperature in the mid-eighties (30 degrees Centigrade), bare bodies as far as the eye could see, I was hanging and flopping in a vertical arc like you would not believe as I walked along the sand. A few times my fiance squeezed my arm and whispered, "would you please strap that darn thing to your legs, people are looking." Of course being a normal guy with an ego, it made things worse (more exciting) knowing women were staring at my dick.
An observation I can make about the guys. In truth I would say most, upwards of 90% of the men at Cap d' Agde had pretty average sized equipment. Those here at LPSG.ORG are definately not the norm of what is out there in everyday life. The 10% that were above average is where the flop came in, most swinging horizontally back and forth. I noticed the loose vertical swingers numbered but a small handfull, myself and this one Italian looking fellow who paced the beach restlessly with a dark tan 9" to 10" uncircumsized wanger flopping wildly wherever he walked. (At least I kept mine somewhat under control having to walk carrying the umbrella, the cooler, and one of the beach bags.)