is shown in a positive light?
I can think of three terrible examples which send a clear message that only "bad" women masturbate:
-- Single White Female
The new room-mate is seen mastrubating in her bedroom....oh! And guess what, she turns out to be a psychopath
-- Presumed Innocent
Harrisson Ford vehicle from the 90s. His wife is a SAHM and one day he comes home from work unexpectedly during the day and discovers her in the bedroom masturbating....oh! And guess what, she turns out to be a murderer, too
-- Black Swan
The horrid, manipulative direcor actually tells Nina to prepare for the role as the black swan by trying to get in touch with her dark side.....yes, by masturbating. Because only women who need to channel their dark alter egos ever masturbate.
So, other than Sex And The City which is the obvious reference point, any positive examples?