"Traditionally, being 'straight' refers to one's sexual and romantic interest as being in the opposite sex," New York sex and relationship therapist Todd Baratz, LMHC, tells mbg. But does that mean only ever liking women? Not necessarily.

"The reality is sexuality is expansive and diverse," Baratz says. "Just because someone identifies as straight doesn't mean that they can't and will never have romantic or sexual feelings for an individual of the same sex." This fluidity goes both ways, he adds. "One person who identifies as gay may also have sexual or romantic feelings for women. There isn't a universal definition for any sexuality."

Identities like "straight" and "gay" may seem concrete and permanent, but in fact, research shows they're subjective and can change over time. "Straightness, just like gayness, is an individually defined subjective reality," Baratz says.

Moreover, there are lots of other categories to choose from—there's a whole spectrum of sexuality between the extreme opposites of gay and straight.