Like "Bi is great" I too had my first bi experience at a beach in Melbourne, Sunnyside Nudist Beach... any one know of it? Always thought myself as str8, I Love pussy and everything about it, but once I started visiting a nudist beach I saw the female and male body in a different light.
I got turned on looking at those cocks swinging from side to side, shaved, long, short, white, black.. you name it.. even erect ones. Then it happened almost by accident, I fell asleep while enjoying the sun on my naked body and must have been having a sexy dream when I woke with a massive hardon. A guy not so far from me must have noticed becaus enot long after while trying to hide my shame that he casually came over and started a conversation. After some small talk he came right out and said what a nice cock I had... I didn't know what to say, only thanks!
To cut the story short, once the beach was less crowded he reached out and touched my cock and that was it. That evening I sucked my first cock and had another man suck mine. Been bi ever since and have had the oportunity to play with couples and single bi guys.
I also have written about my experiences (Bi, attending swingers parties with my ex wife and some others) on the Literotica site. If interested let me know and I will supply my Literotica name.