When I was a professional journalist writing for magazines and newspapers my rate was $1 a word ($2 a word if I could get it, which happened a few times). But that was "back in the day" as the kids say. I would not pay that for a blog post for porn. LOL
Instead I would pay a flat rate per post, say $5 for around 300-500 words. But you can also do a search on Fivrr and Upwork to see what writers are getting. But bear in mind many writers post a very high rate on their profiles but will take far less for an actual job.
Good luck!