Miss Universe, Venezuelan Alicia Machado, left, appears with Donald Trump at his Mar-a-Lago club in Palm Beach, Fla., on Feb. 15, 1997. (Lannis Waters/Palm Beach Post via AP)

Early Friday, the Republican candidate for president of the United States urged his 11.9 million Twitter followers to watch a woman’s sex tape.

This woman, Donald Trump wrote, is “disgusting.”

Trump was talking about Alicia Machado, the first woman to win the Miss Universe title under his pageant leadership. Machado, who hails from Venezuela and became a U.S. citizen in May, was 19 when she earned the title. She gained weight after the contest, telling reporters she had stopped starving herself.

Her new boss didn’t take it well, she said. ““He'd yell at me all the time,” Machado said in a Hillary Clinton campaign ad, out this week. “He'd tell me 'you look ugly' or 'you look fat.’ ”

Trump doesn't deny that. He responded instead with an attack on Machado's character, one that apparently links her credibility to her bedroom practices.

Critics say Trump’s tweet-storm highlights an ancient double standard: The sexually active man receives praise, and the sexually active woman gets mocked. It's unclear what, exactly, Trump meant when he invoked Machado's "past."

On Tuesday, Trump supporter Scottie Nell Hughes blasted her on CNN for appearing in Playboy. When the press seized on nude photos of Trump's wife, Melania, the Trump campaign defended Melania. (As did women's groups.)

“They’re a celebration of the human body as art, and [there’s] nothing to be embarrassed about with the photos," spokesperson Jason Miller said on “Reliable Sources.”  "She’s a beautiful woman."

Trump, meanwhile, has publicly celebrated his own sex life.

Emily Lindin, founder of the “UnSlut Project,” an organization that seeks to end the stigma around women having sex, said Machado's sex life shouldn't obscure the fact that Trump once told her to skip rope on television.

“It’s public slut-shaming, and it’s by a really powerful man,” Lindin said. “Pointing out that she had sex once doesn’t discredit what she’s saying.”

In 1996, Trump invited reporters to watch Machado exercise in a Manhattan gym, or, as he put it, work “on her problem.” He doubled down on the stance Tuesday, telling Fox and Friends her weight had been “a real problem.”

Hillary Clinton brought up the story in Monday’s presidential debate, asking viewers to consider Trump’s treatment of women“He called this woman ‘Miss Piggy,’ ” she said. “Then he called her ‘Miss Housekeeping,’ because she was Latina. Donald, she has a name.”

Machado, now 39, quickly dominated the election news cycle. She appeared on national talk shows, repeated her claims and emphasized that she wasn’t perfect. (At one point, she called Trump a “Nazi rat" and jabbed his wife's English-speaking skills.)

As for the “sex tape,” nobody has found it. A Daily Beast reporter uncovered "non-explicit footage from a Spanish reality-TV show in which the Venezuelan model supposedly had sex with a fellow participant."

But even if she had shot a home movie with a partner, Lindin asked, why would that matter?

Some Twitter users wondered the same thing.