A shocking viral video shows a horny senior citizen man harassing an American male for sex on a train in Singapore. “You gay. I gay too,” said the old man to Joe DeMarini.

The elderly man repeatedly hounds DeMarini to have sex with him. Two women come to the young man’s aid — including his female friend who is threatened by the older man.

Be careful when you travel to parts of Asia or the Middle East if you are an American male. American soldiers are repeatedly warned to watch their backs — literally.

That’s because men are solicited for sex with men openly and raped repeatedly over there.

As the old man said, “Singapore is not America; We can touch you!”

CAUTION: Graphic language that may be disturbing to some viewers. Discretion is advised.