Bondage is having a moment.
Not for the first time, of course.
When "Fifty Shades of Grey" became a surprise megahit, selling more than 100 million copies, adult toy stores described a sharp rise in women snapping up blindfolds, handcuffs and, most of all, Kegel exercise balls, which had a memorable cameo in the book. Caught off guard, the balls were often out of stock and one manufacturer had to implement night shifts to keep up with demand.
But that was after the book.
When the "Fifty Shades" movie hits theaters widely Friday, expected to pull in at least $50 million over the four-day weekend, the steamy scenes that spurred some couples to...