Why are there suddenly so many bisexuals on TV?

Vulture

One reason, according to Kathryn VanArendonk: "Almost universally, the stories that these shows have found to tell about their characters coming out, about their romantic relationships, and about the mysteries of sexual attraction are more interesting than the straight stories. I have seen so, so many love triangles. I have seen so many will-they-won’t-theys that then coalesce into 'they did!' and then have to find somewhere else to push the story. I have seen countless heterosexual true loves, and I’ve watched them grow into flawed but loving marriages, and I’ve loved many of them. But it is just so nice to watch love stories that explore territories outside the painfully familiar 'how will that nice lady ever land a husband' world. It’s so nice to watch stories with something different to say about attraction and the complexity of adult relationships."