Hundreds of people came, but in the end it was just not enough to capture the gold.

The Blast can report the official number logged in Las Vegas at the attempt to break the record for the largest orgy was 375 ... 125 bodies short of breaking Japan's record of 500 people.

Sources connected to Sin City 8 tell us they attribute the "L" to the shuffling around of the location by the venues. As we reported, Embassy Suites first bailed on the orgy and weekend long sex romp, and then a last minute scramble from the Erotic Heritage Museum to the Green Door adult social club unfortunately resulted in lower attendance than promoter MenageLife initially expected.

However, we're told even though records weren't shattered, guests that showed up had an amazing experience. We're told the participants were happy, and overall the weekend and event were great for the swinger lifestyle and community as a whole.

We're also told organizers already have their sights set on coming back in full force next year for another shot at the world record, so much like the actual Olympics, we must let the competitors rest up and train for Sin City 9.

Congrats to the participants -- it may have been a loss -- but you're all winners in our book ... just not the Guinness Book.