The other guy does it is not an affirmative defense.
Meantime,
https://www.washingtonpost.com/news/...ile-in-office/
"Former Oklahoma state Sen. Ralph Shortey has reached a plea deal with federal prosecutors months after investigators uncovered a secret life that they say involved child pornography and a rendezvous with a 17-year-old boy he had met through Craigslist’s personal ads."
https://www.nytimes.com/2017/11/20/b...isconduct.html
"The New York Times said on Monday that it was suspending Glenn Thrush, one of its most prominent reporters, after he was accused of sexually inappropriate behavior.
The move came after the website Vox published a report containing allegations that Mr. Thrush, who joined The Times to cover the Trump administration in January, had acted inappropriately toward women. Mr. Thrush was a reporter at Politico before coming to The Times."