"Meh" on the voice overs. But -- I did see something like that when I visited Animal Kingdom at Walt Disney World a couple of years ago:
These two monkeys were really going at it on top of the jungle gym in their enclosure. Of course, it stopped traffic; a crowd had formed, people were giggling and pointing. Very innocently, a little boy asked his mom, aloud, 'Mommy, what are they doing?" The mother, kind of embarrassed, started to answer, "Well, honey..." Without missing a beat, some fat schmuck blurted out, "They're having sex, kid!" Immediately, the little boy followed up with, "What's sex, Mommy?" The mother turned around and gave that guy a real dagger look.