Ambisexual

Ambisexual is a term with many different meanings.

In the 20th century, "ambisexual" usually meant either intersex, androgynous, unisex/gender-neutral, or an mspec orientation, depending on context. The word's first recorded usage was in 1938.

Erwin J. Haeberle's 1978 text The Sex Atlas used "ambisexual" as a more precise term than bisexual.

Sexologists Masters and Johnson defined an ambisexual as someone who has sexual interest in partners regardless of sex, with no preference, and who "has never evidenced interest in a continuing relationship", as well as their sexual activity history being closest to 3 on the Kinsey Scale.

In the early 21st century, some people used "ambisexual" to specifically mean an orientation similar to what is presently called heteroflexible: "usually a tendency toward opposite-sex sexual attraction coexisting alongside occasional sexual attractions and encounters with the same sex."

A 2019 book titled Ambisexuality defined "ambisexual" as a man who is sexually attracted to trans women. This definition can be considered transmisic since trans women are the same gender as cis women.