In her new essay, she lays out the timeline: sex stopped six months after their son was born, and the marriage was over less than a year after that. The cheating reports came around the same time she walked away. “Six months after my son was born, my husband and I stopped having sex. Less than a year later, we separated.” That’s how Emily Ratajkowski describes the end of her marriage to producer Sebastian Bear-McClard in a June essay for The Cut…