Quote from Barney in Coming Back
Barney: For the next 200 years, every male member of the Stinson family was afflicted by the Gypsy's curse, an unquenchable thirst for booty that no committed relationship could ever satisfy. That is, until my brother James met his husband Tom. The day they got married, they lifted the curse forever, freeing me from the shackles of having sex with lots of different women. Although, sometimes Robin and I still use the shackles. Bondage five! Robin: Whoa. I can't, I can't, I can't.