U.S. sex educator Betty Dodson has died at the age of 91, according to The New York Times.

According to the magazine, Dodson, known as an advocate for women’s sexual pleasure and feminism, died at a nursing home in New York City on Saturday.

Dodson’s longtime business partner Carlin Ross tells The New York Times that the cause of death was cirrhosis of the liver.

Ross also told of his friend's death on Instagram.

- I felt like he's been suffering for the last two weeks.

He got morphine.

I felt him flew farther and farther and hoped he could get rid of his body.

He had such a strong energy, I miss him so much, Ross said on Instagram.

Pictured is Dodson with Ross.

Dodson had a long career as a sex educator and taught women to masturbate for decades through a variety of workshops, books, and videos.

Born in Kansas, Dodson moved to New York in the 1950s to advance his career as an artist.

Dodson noticed in orgies held in the city that women often played their orgasms and realized that many had no knowledge of how to produce pleasure for themselves.

So she decided to get down to business and start guiding women towards better sex.

In 1968, Dodson staged her first one-woman erotic show at the Wickersman Gallery in New York, and soon after, left her career in the art world to focus on sex education.

Indeed, she became known as a pioneer of women’s sexual freedom, inspiring millions of women to explore their bodies and enjoy them boldly.

Early in his career, Dodson held teaching sessions at his apartment in Manhattan, where he guided women to the secrets of their intimate areas and showed how masturbation can be enjoyed.

According to Dodson, her “masturbation business” was an extremely important job that would make women no longer sexually dependent on men.

He believed it would make everyone happy in the end.

Dodson also saw masturbation as a beautiful thing that can go with a person through this life and its pitfalls, from young to old.

- Betty Dodson was a courageous and courageous defender of women’s rights in sexual awareness and enjoyment.

Her workshops guided women to the beauty of their own bodies, and her brazen courage allowed women to reveal the truth, Ms.

Magazine founder Gloria Steinem described her colleague to the New York Times.

Dodson’s work was heavily criticized in its day, as some feminists equated it with pornography.

She later became a respected driver of the good news of sex, whose work is seen as an important part of the liberation of women’s sexuality.

During his career, Dodson published numerous books, including a biography of Sex by Design in 2010. He married Frederick Stern, who worked in the advertising industry from 1959-1965.

Dodson began his career as an ambassador for sex positivity shortly after his marriage.