Jessica Fern's 'Polysecure' promised a world beyond monogamy. She didn't say it would be easy.

Jessica Fern's 'Polysecure' promised a world beyond monogamy. She didn't say it would be easy.

Mike BellemeWhen Jessica Fern joined Feeld — the "dating app for open-minded individuals" (or as some call it, the threesome app) — she wasn't looking for love; she was looking for someone to dominate her. Under smiling photos of herself hiking a waterfall in Costa Rica, she wrote that she wanted to explore BDSM with someone who could offer genuine emotional connection."Kink isn't my primary sexual style," she told me as we drove through the mou…