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A frisky gorilla at the Bronx Zoo gave onlookers an X-rated show when he performed oral sex on his excited friend in front of a group of zoo-goers. 

A father at the zoo with his wife, four-year-old daughter, son and niece captured footage of the NSFW scene, which took place at the NYC zoo's Congo Gorilla Forest. 

It is unclear whether the other gorilla is male or female, with the Bronx Zoo declining to comment further when contacted by DailyMail.com.

'I was shocked and had no idea that was a "natural act,'" the man, who chose to stay anonymous, told the New York Post. 

He added: 'My wife had to stay out of the exhibit with my sleeping son, so I wanted to capture a lot of video. Then this magic happened.'

The 'magic' he captured on video proved humans aren't the only ones who get down and dirty for fun.