Recently, residents of Hong Kong’s Sheung Wan neighborhood were witness to quite the unexpected show, watching from the street as a couple got it on inside a well-lit apartment room with windows uncovered to the world.

A crowd of at least a dozen people gathered around to watch as a naked man thrusted again and again into his partner, who was lying down on the bed with legs up. In the video, a lot of chatter and laughter can be heard from the excited onlookers. One man is heard admonishing some youngsters, saying they aren’t yet old enough to watch what is going on. Another is heard wondering if the couple are doing some yoga.

Once the man finishes, some in the crowd can be heard shouting eagerly for his partner to “stand up!” before being hushed by their fellow spectators. The naked man then returns with a towel to clean up and finally the other party sits up, revealing himself as another guy. The crowd goes wild.

The video briefly went viral on Facebook earlier this week before being taken down for obvious reasons. Hong Kong’s Oriental Daily writes that some commenters said the event was more exciting to watch than the World Cup.

A reporter visited the scene the following day, only to find a darkened apartment room. There has been much speculation about whether the couple actually wanted to be watched. A local lawyer has been quoted as saying that the two men could conceivably face charges of public indecency — a crime that could result in an HK$1,000 fine ($127) and six months in jail.

Police are investigating the matter.