Adult pinboard RSS autopost

Hi guys, I read in a couple of threads here that you can set up one of the adult pinboards (sex) to autopost from RSS. It seems like this feature is no longer allowed, or maybe I'm just not looking in the right spot? I've googled around but haven't found anything. Anyone know how to do this?

Or, does anyone know of any other ones that allow this?

sex.com still supports posting via rss feed but somehow this is really buggy and they don't seem to care about it.
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