Girlie magazines from the 40's to the 70's are a particular interest of mine, and Yoc made a brief comment elsewhere that these magazines often bought cartoons from comic book artists. A lot of them tried using different styles or names to disguise who they were, since girlie mags were considered a sleazy business.
The most obvious one is Bill Ward, of course. Originally, he used a pseudonym to sign his adult stuff, but he gave that up quickly enough. His style always fascinated me. A lot of comic book artists who did more realistic art often complained that they had a hard time doing more cartoonish art, but Ward managed to go from "Blackhawk" and the more realistic version of "Torchy" he did during WWII straight into his enormously endowed women for magazines like Jest and Humorama.
Ward used to have two portfolios for his adult stuff. He called them his "A-Style" and his "B-Style". He worked harder on the A-Style stuff and it showed, so he was able to charge more for it. The B-Style work went to cheaper publications that couldn't afford his better work. Toward the end, I think, he either lost the ability or the desire to do the A-Style work. His art was never the same again after the mid 1970's, in my opinion.
Dan DeCarlo, on the other hand, didn't change a thing between his work on Archie and adult cartoons. Since his was the "house style" for the Archie books, I find his adult stuff very interesting, especially since most of his women looked like Betty and Veronica. Seeing them as strippers and working girls kinda makes you wonder what they did when they grew up. LOL.
I'm sure there are a lot more comic book artists who also sold cartoons to the men's mags. Does anyone know of others?