After a well-known chef tried but failed to drag Rachel Waynberg, then a 27-year-old restaurant marketer, into the bathroom at a party, he still bragged to everyone around that he'd had sex with her.
Last year, as Iman Oubou, the founder of Swaay, a new-media company for women entrepreneurs, wrapped up her first-ever investment meeting, the potential backer suggested they could "seal the deal" in his hotel room.
When Amy Rose Spiegel, the editor-in-chief at Brooklyn-based Talkhouse Media, was 19 and interning at Death & Taxes seven years ago, co-founder Stephen...