Scarlett Johansson is having second thoughts on monogamy. In Playboy's March/April 2017 issue, the 32-year-old “Ghost in the Shell” star admitted that she isn’t sure people are designed to be monogamous in relationships. “I think the idea of marriage is very romantic; it’s a beautiful idea, and the practice of it can be a very beautiful thing,” said the actress. “I don’t think it’s natural to be a monogamous person. I might be skewered for that, but I think it’s work. It’s a lot of work.” …