Perhaps it is assumed men are the primary viewers of smut but I knew someone who owned an independent video store (all types of movies) years ago and he told me it was about 60-40..
This is from 2012 and the study perhaps isn’t the best example but:
Who said porn was just a man’s thing? A study released on Friday challenges the myth, showing that four fifths of French women have watched a porn movie before — one in two of them without their partners.
Fully 82 percent of women questioned said they had watched an X-rated film at least once before, compared to 99 percent of men, according to the study of 579 women carried out by the IFOP polling institute in September.
Having watched a porn movie once does not equate to a porn addiction.