Ryan English carried out the sickening attack while at the venue working as a DJ.
The sick 22-year-old went on to carry out further rape and sexual offences against the vulnerable child on around 20 occasions, reports show.
He first attacked the young boy when he was working as a DJ at the club seven years ago.
English also targeted another victim in 2017, in the toilets of a different working men’s club where he was the DJ at a fifth birthday party.
English was jailed for nine years at Leeds Crown Court.