@sun You may be right about 20 years. The "Miss Stevenson bangs a boy" episode of South Park aired on October 18, 2006. The PA "Pedo Unicorn" [1] followed 2 years later as the narrative developed. The earliest post in "Teach Women Not To Rape (Cont'd)" series at Instapundit appears to be made in 2014[2], preceded by a precursor[3]. The South Park clearly was a thought leader on this.

[1] https://www.penny-arcade.com/comic/2010/02/03/questionable-on-many-levels

[2] https://instapundit.com/196980/

[3] https://instapundit.com/193495/