It wasn't a satanic thing. I mean, maybe it was for some, but nobody I knew that played Dungeons and Dragons was even remotely interested in worshiping Satan. We left Satan and all his deeds to the kids with the big hair and the chains and the black clothes, but they didn't really want him either. They wanted Robert Smith. They were just born a few years too early to know it.
It was really just for the porn. Outside of a dog-eared, all but illegible copy of the Hitchhikers Guide to the Galaxy, there was no book I read and re-read more than Gary Gygax's Monster Manual, the first hardcover book for what was to be known as "Advanced" D&D, and by "Advanced," I'm pretty sure they meant, "Now with boobies!"
Although the manual gave a frequency of "rare" for succubi, they still kept showing up in almost every game of Dungeons and Dragons I played from age 10 onward. And don't think they were held to the "number appearing: 1" rule, either.
Rest in peace, Gary Gygax. 1938-2008.