Actress Rose McGowan says she was raped by Hollywood 'studio head'

Warning: graphic language in tweets

Actress and singer Rose McGowansays she wassexually assaulted by a Hollywood executive, who she only refers to as a "studio head."

In a series of tweets to her 635,000 followers, the Grindhouse and Charmed star said the assault had been "an open secret in Hollywood" andshe didn't report it after being discouraged by alawyer.

"A [female]criminal attorney said because I'd done a sex scene in a film I would never win against the studio head," she wrote in one tweet posted Thursday.

Usingthe hashtag#WhyWomenDontReport, McGowanis one of many women speaking outabout sexual assaultfollowing the release of a tape last week which caught Donald Trump makingcomments about groping women.

• Nancy O'Dell, a target of Donald Trump's comments about women, speaks out
• Donald Trump calls sex assault accusers 'horrible, horrible liars'

A day after the Trump tape was leaked, Canadian writer Kelly Oxford, who has more than700,000 followers, asked women to tweet their "first assaults,"using the hashtag #notokay.

What followed was a flood of responses: Oxford reported that 30 million people had read or contributed to her feed within a five-day span.

At one point, the L.A.-based author and screenwritersaid she was receiving 50 tweets per minute from people about their experiences.

While Oxford maintains the #notokay campaign isn'taffiliated with a political organization,McGowan is an active supporter of a social media movement called #WomenCanStopTrump. Shehas alsobecomeknown in Hollywood for calling out sexist andquestionable, but accepted, practices.

She says shewas fired from her talent agency after posting audition instructions for a film last year that asked women to wear something that "shows off cleavage."