Bay Area Rapid Transit police are investigating the identity of a man and woman videotaped having sex on a BART train after the NSFW video went viral via World Star Hip Hop and Facebook.

The sex tape footage, which you can see here, shows a woman straddling a man and apparently engaging in intercourse on the seat of a BART train in San Francisco. The couple is mostly clothed in the 55-second video, which has surpassed more than 1.4 million hits on World Star Hip Hop as of Monday afternoon. The BART train-sex video also made the rounds on Facebook but was promptly removed by the social networking site.

So far, BART police have been unable to identify the couple. But if they do, the pair can expect to face misdemeanor charges for having sex on a train. The video appears to have been shot on a cell phone by a passenger sitting across from the couple.

“It’s not considered a serious, violent offense, but it is something that we take seriously,” BART Deputy Chief of Police Ben Fairow told NBC Bay Area. “It’s also one of the crimes that’s eligible for an AB 716 prohibition order, which is a new law that went into effect to prohibit certain individuals who commit certain offenses from being in or around our properties.”

BART spokeswoman Alicia Trost discouraged such behavior.

"Lewd activity is not only highly inappropriate on BART, it is illegal. It can and will get you banned from the entire system," Trost told the San Jose Mercury News. "Do yourself and the families who ride BART a favor and keep it in the bedroom."

The newspaper noted that the video surfaced two months after BART started enforcing a state law that allows the transit agency to institute one-year bans on riders found to commit a wide range of crimes and violations.

The enforcement began May 6. BART has issued 32 “prohibition orders” since then.

That number will climb if BART identifies the couple that had sex on the train or anyone else who decides to become an amateur porn star.

"Should any individual(s) be positively identified for doing lewd behavior on a BART train or other BART property, under (the new law) BART PD can issue a prohibition order banning the identified parties from riding BART," BART spokeswoman Luna Salaver told the Mercury News.

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