Simply put, sexuality is complicated.

In 1948, famed American sexologist Alfred Kinsey and his colleagues published "Sexual Behavior in the Human Male." The book included the Heterosexual-Homosexual Rating Scale, more commonly known as the "Kinsey Scale." Based on their subjects' sexual histories, Kinsey's team made a scale from 0 to 6, with 0 being exclusively heterosexual, 6 exclusively homosexual, and 3 being equal parts of the two.

Demonstrators march for marriage equality in Mexico City. Photo by Yuri Cortez/AFP/Getty Images.

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Doubting someone is gay doesn't always stem from thinking being gay is "wrong."

But that doubt can still be really destructive, even if the doubter doesn't mean to be.

A reader of mine wrote in asking for some advice. She has one granddaughter who is gay, and whom the reader felt she always knew was gay. But her younger granddaughter says she is too, and since her preference seemed to develop differently, the grandmother is doubtful.

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