Yes, Zappa propositioned his secretary (who later wrote a book about him) even as he had a wife and kid at home.
But apparently he drew the line at hard drugs.
“Zappa was a sexual libertarian and enthusiastic celebrant of “groupie culture”
http://www.theguardian.com/music/2011/oct/03/frank-zappa-women
But apparently he drew the line at hard drugs.
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Any drugs, actually.
He fired Lowell George (who went on to form Little Feat) after Lowell wrote the song Willin.
At least that’s the story Lowell used to tell at shows.