You don’t have to get on a train to go downtown.

A Manhattan couple apparently turned on by the sights, sounds and smells of New York’s least romantic locale had sex in not one but two subway stations on the same day, cops said on Tuesday.

The two turned Grand Central into glans central during a caught-on-camera tryst amid the climax of the evening rush around 6:40 p.m. Nov. 22 — mere hours after getting heated at the Bowling Green station, sources said.

A graphic, 38-second video, shot from inside a train at the bustling Midtown station, opens with the rail-riding Romeo locked in a passionate embrace with his lover on the grimy 4/5/6 train platform. An apparently stunned silence fills the car, broken only by a prerecorded “Stand clear of the closing doors” announcement, as the man appears to perform oral sex on his partner, sprawled out on a pile of their crumpled clothing with a rolling suitcase by her head.

The Grand Central get-down was the apparent encore for a performance earlier in the day, when what police believe to be the same couple got hot and heavy at Bowling Green.

Around 9:30 a.m., the female half of the duo performed oral sex on her partner as he sat on a platform bench in full view of commuters, according to cops.

Investigators released a surveillance photo of the man from that incident — though the woman wasn’t caught clearly on camera — and are looking to slap cuffs on the randy duo.

Even steel-stomached New York straphangers were skeeved by the public display of way-too-much affection and were hopeful that the two’s next intimate act would be a conjugal visit.

“Oh, my God, is that nasty!” shrieked Naiikeema Graves, 25, at the Woodhaven Boulevard M/R station in Queens.

Graves’ concerns didn’t stop at hygiene or prying eyes, either.

“It’s way too cold for that,” she said. “Seriously, rent a room.”

Olson Leiva, a roofer from the Bronx, echoed the sentiment that four walls and a roof would do the couple some good.

“They should find a hotel,” he said. “Not the subway. It’s disgusting, it’s degrading.”

Rider Quincy Jones, 25, agreed the duo’s daring was “disgusting,” but posed an alternate, sickeningly sweet interpretation.

“I guess New Yorkers just don’t have enough space these days. So they’re making their own,” he said. “Either that or their love is just that strong.”

Additional reporting by Craig McCarthy