Thin-skinned?

Charlie Sheen underwent weight-loss surgery after a sex worker flippantly commented on his gut, he revealed in his new memoir, “ The Book of Sheen .”

The actor made the revelation while recalling the time he and his brother, Emilio Estevez, were in Toronto to film the 2000 film “Rated X.” The two portrayed the Mitchell Brothers, pioneers in the pornography business, in the biopic.

Sheen explained that on his final night in Toronto, he decided that his “celibacy streak” needed the “closure” he’d find in “the matchmaking Yellow Pages of Bell Canada.”

The “Two and a Half Men” alum, now 60, proceeded to order a “gorgeous brunette” to his hotel room.

While enjoying a “post-euphoric cigarette” with his “Canadian insta-girlfriend,” Sheen said that the woman “reached over and

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