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According to a survey from BonusFinder.com over 70% of Americans cheat while attending a bachelor/bachelorette parties.
And to clarify this wasn't just the bride and groom, this is including all attendees of the parties.
The most common instances of infidelity included receiving a lap dance (33.1%) and smooching (21.3%). Yet 11.2% of attendees admitted to sleeping with someone else — and 9% said that they got hot and heavy in the sheets as part of a threesome.