MIDTOWN — Police are looking for a man who they say groped another man while he was sleeping in his midtown Manhattan apartment, the NYPD said Tuesday.

The incident happened on Thursday at about 4:30 a.m. at an apartment building located neat West 51 Street and 9th Avenue. Police said the individual entered the victim's door through an unlocked door, and once inside, the man approached the 21-year-old man who was sleeping in his bed and grabbed his penis.

The victim has just returned to New York from DC with his girlfriend that night. Tired, they forgot to check the door to make sure it was locked. He believe that’s how the intruder got in.

“Basically he was touching my genitals and I woke up like that, and my girlfriend was laying next to me," the victim, who does not want to be identified, told PIX11.

When the victim awoke, the man placed his fingers to his lips for the victim to be quiet. The man then walked out of the apartment and fled the building on foot westbound on 51st Street.

“Kinda happy it happened to me and not my girlfriend,” he said. “Mentally it’s a mess; I feel like I’m damaged.”

Police released surveillance video of the alleged attacker walking on the street after the incident.

The man is described to be between 30 to 35-years-old. He was last seen wearing a multi-colored scarf, black coat, gray shirt, blue jeans and dark-colored shoes.

Submit tips to police by calling Crime Stoppers at 1-800-577-TIPS (8477), visiting www.nypdcrimestoppers.com, or texting 274637 (CRIMES) then entering TIP577. Spanish-speaking callers are asked to dial 1-888-57-PISTA (74782).