Incubus Dreams, but I think it would have been NiC if I'd actually paid attention rather than skim-reading my way through. Was it ID in which they fuck a lot, then the cops call and say, "We have another dead stripper"? Because that was it. When I realised I actually could not remember the supposed "plot" of the book because they'd just spent hundreds of pages in bed. I honestly thought they were referencing an earlier book in the series, because dead strippers seemed familiar, but I just couldn't figure out when they'd been mentioned previously.