New York- A man who arranged to meet a “woman” for oral sex in an Upper East Side apartment got more than he bargained for – first, the hooker turned out to be a man, then “she” stabbed him, and finally, “her” roommate sprayed him with Mace, police said.

Glenn McDowell, 37, was stabbed several times in the hands, abdomen and buttocks at around 3:30 p.m. after getting into a heated argument with the prostitute, who he thought was a woman when they met last month in an Internet chat room.

McDowell, of Brooklyn, arranged to meet Andrea Williams, 18, yesterday at an apartment on First Avenue near East 68th Street that she was illegally subletting, police said.

Williams allegedly agreed to perform oral sex on McDowell in exchange for $100.

The tranny told cops that while the sex act was going on, McDowell – not knowing his date was a he – asked to have intercourse.

Cops said that when Williams turned him down, McDowell turned violent and the tranny pulled out a knife.

That’s when Williams’ roommate, Marie Delince, 35, used Mace on both of them to end the fight, a police source said.

McDowell scrambled for the door, running out of the building and making his way to a pizza parlor.

He asked to use the bathroom, and customers noticed he was trying to stop the bleeding with napkins.

“He came out of the bathroom and he looked out of it,” said Robert Shala, an employee of the restaurant.

McDowell told EMTs who were treating him that he had “been hit by a car,” witnesses said. McDowell was taken to New York Hospital.

Williams was arrested last night and charges are pending, sources said. Shala said Williams and his roommate “looked like two fat girls. You wouldn’t be able to tell if either of them was a man.”