Tailored Encounters by Im_bloody_English is awesome. If you don't know it already check it out

You can find it here on TSR
http://spikeluver.com/SpuffyRealm/viewstory.php?sid=19688Buffy Summers is successful and content with every aspect of her life save one: her sex life. Sick of methodical vanilla sex with her current boyfriend, she still has never been able to achieve an honest first-rate orgasm in her entire life. Then one day she stumbles upon a mysterious escort service online that offers her hope of a perfect sexual experience and impulsively decides to seek out their help. What starts as a simple business transaction turns into a night of unbridled passion-filled sex with the handsome stranger the service pairs her with, leaving both of them to question if once is truly enough. Room Service by PaganBabyhttp://spikeluver.com/SpuffyRealm/viewstory.php?sid=80&warning=AO-AdultsOnlySummary:
All Human. Buffy is spending the weekend in New York, away from her friends and family. She's lonely until a gorgeous, blond man steps into her life and her hotel room.There are also two sequels that are just awesome.
Girls night out by PaganBabyhttp://spikeluver.com/SpuffyRealm/viewstory.php?sid=69Takes place in Season 7, Spike works as a stripper. The girls go to a strip club. A dancer catches Buffy's eye.There is also a pretty good story, where Spike and Buffy work as operators for a sex hotline. I can't remember the title or author but maybe someone else does. If you are interested in stuff like that, too.