Alison X owner of The Erotic Challenge and The Submissive Challenge websites DOES NOT PAY for your work though she has rates of pay for submissions posted and promises payment in her acceptance email. She advertises with a call for submissions on craigslist. She will publish your work on her site without paying you. Her excuse is that neither Western Union nor PayPal will give her an account. She ignores suggestions that she pay with a money order or use a service that will give her an account. She ignores requests to remove the item from her site.
You can see my submission to her site here - obviously the site is still up and still has unpaid writing on it. You can see my correspondence with her here.