Cosby has repeatedly said that theallegations are untrue. And he has never been prosecuted.
But since 2005, a handful of women have made the claim. This year, those accusations resurfaced, and on Monday, a seemingly harmless post to Cosby's confirmed Twitter account turned them into a social media storm.
In its wake, one of his accusers, Barbara Bowman, turned to the public once more with an article in the Washington Post. She also spoke to CNN's Don Lemon.
Bowman claims she was drugged then raped, though she said she never saw drugs.
"I woke up out of a very confused state not in my clothes." She said she knew her body had been touched without her permission. This occurred several times in the course of their contact, she said.
She said to CNN that Cosby told her she had been drunk.
Bowman was 17 back then in 1985, an aspiring actress, and was in a mentoring relationship with Cosby, she said.
She spent time in his home, which included dinners with the star.
Despite what she said was happening to her, she kept coming back. And Cosby and her agent financed her apartment in addition to supporting her acting ambitions, she said.
She was afraid to talk to her agent about her concerns, and she felt Cosby's influence over her was too powerful.
"I was terrified of him," she said.
"As a teenager, I tried to convince myself I had imagined it. I even tried to rationalize it: Bill Cosby was going to make me a star and this was part of the deal," she wrote in her Washington Post article.
CNN has reached out to Cosby's representative for comment on this story, but has yet to hear back.
On Monday, the comedian -- or whomever was in charge of his social media -- put out a challenge with a jovial picture of Cosby in a cap: "Go ahead. Meme me! #cosbymeme."
The Internet immediately reacted, but probably not in the way Cosby expected.
"Claire, have you seen my ... never mind, found my raping hat!" tweeted Trill Withers over the cap picture.