Cara Delevingne is sharing her personal journey with sexuality in the forthcoming Hulu docuseries “Planet Sex.”

In each episode of the series, the British model and actor explores prevalent questions about gender and human sexuality. She immerses herself in communities who view sexuality and gender in different ways, as well as examines such topics as relationships, sex appeal and the intrigue of pornography.

Delevingne spoke about the docuseries in Cannes at the international TV market Mipcom last fall, including one moment that tested her limits in terms of sex.

“I went into the masturbation seminar thinking it was going to...