A Sydney hotel worker has been charged with the sexual assault of a young male who was passed out drunk at a train station.

The man was granted bail during a brief appearance in Central Local Court on Friday.

Police allege the heavily intoxicated 18-year-old victim had been out with friends before he made his way to Central railway station in the early hours of January 8.

He passed out sometime before 3.30am (AEDT) and awoke to find the man allegedly performing a lewd act on him.

Following inquiries by police, the man was arrested at a hotel in Darling Harbour on Thursday and charged with one count of sexual intercourse.

He was granted conditional bail which included a surety of $10,000.

His wife was among family members who supported him in court.

He will appear before Downing Centre Local Court on April 9.