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“One of April’s friends had this term for her: heteroflexible,” Ms. Berry said.

I’m a guy, 24, predominantly straight but heteroflexible, I’d say—I hooked up with guys but recently haven’t felt attracted to men lately.

Occasionally bi, vaguely bi, and heteroflexible are all other ways you might describe yourself.

The singer Demi Lovato, meanwhile, identifies as “sexually fluid”, or “having a shifting gender preference”, while other labels for being neither exclusively straight nor gay include “heteroflexible” and “questioning”.

The application lets people choose from a variety of sexual orientations, like straight, heteroflexible, mostly gay, and asexual, and three gender options: male, female, or nonbinary or non–gender specific.