The Flick of Master's Cane

This is the work of an artist who signed himself Rex.

He provided the cover art and a variety of interior illustrations for the first 12 issues of a British fetish magazine that made its first appearance in October 1971 as Mentor ("Published monthly by Janus Publications at 187 Victoria Street, London, S.W.1.") but changed after four issues to its enduring title Janus.

A miniature version of this particular picture (lacking the circled "B") appeared in volume 1, number 6 embedded in a superb short story entitled "Vanessa's Revenge" - irrelevantly, as the story has no male characters whatsoever.

From issue 13 (volume 2, number 1; October 1972) onwards the editorial credit "Drawings by Rex" disappeared from the magazine along with his contributions. Rex had in fact jumped ship to perform much the same duties for a rival publication called Slant that launched in 1973 and ran for at least 15 issues. It never achieved the circulation of Janus, however, and did not thrive beyond the mid '70s.
http://www.bdsm-artzone.de/art-infos/art001/info-rex.htm
http://www.vintagesleaze.com/vsimages-eroticillus/slant-1.11.jpg

At least one other artist, presumably American, also adopted the pseudonym Rex:
http://www.femdomartists.com/femdom-artists/dominate-6.

One website naively assumes the two to be one and the same despite glaring differences in their respective styles (and signatures!):
http://www.petticoatpunishmentart.com/docs/cjart045.html.

Thanks.