I saw on a porno the guy behind her (doggie style) in her pussy and she had this in her ass for it to rub his penis while in her looked awesome as hell new idea I learned today
I have the Njoy toy which was the inspiration for the one you mentioned (i.e. Metal Worx totally ripped off Njoy) and I use the single-bulbed end vaginally and the multi-bulbed end anally. I think that's how it's mostly intended to be used.
