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Dr Mahinder Watsa, a trained obstetrician-gynaecologist, wrote his famous "Ask the Sexpert" column for more than ten years.

Susie Bright, journalist and advice columnist known as Susie Sexpert, appears more than once.

Even a self-professed sexpert like Sciortino, determined to be open-minded, can find it hard to respect the infinite variety of human lust.

She lost her virginity when she was fourteen and thinks she’s some sort of sexpert now.

My Secret Garden didn’t have the gravitas and respectability of say, Shulamith Firestone, but as author Susie Bright, the original “Sexpert” in the 1980s and 90s, says, “it sold millions and millions of copies and was a big wake-up for America’s puritanical, sheltered girls and young women”.