In The Monkees' 1968 film Head, 'Lady Pleasure' is played by I.J. Jefferson, who was Jack Nicholson's girlfriend at the time. Jefferson's real name is Mimi Machu and she had previously been one of the resident dancers on the variety show Hollywood A Go-Go on KHJ-TV in Los Angeles. Jefferson later appeared in the film Drive, He Said in 1971 (a BBS Production directed by Jack Nicholson). Nicholson, of course, was friendly with The Monkees in the late '60s, co-writing and co-producing Head.
Here is Mimi today: