Absolutely trust your gut. He wants to use your boudoir photos to promote his boudoir photography?? I don't think so.
Did you or would you go see his 'studio'?? and/or meet in person? Thought crossed my mind because I'd be curious to see what exactly his studio is, but I sure as hell wouldn't go alone - would maybe take a couple of big burly friends along! But seriously, I might go drive by and check it out from a distance... if it seems safe to do so. Or just say no and move on.