For Tijhor8..I think this is maybe what you meant...not GQ:
"Gent's Club is located in the heart of the city so it is easy to get there. From either Phetburi or Sukhumvit road , drive in to soi Thonglor. When passing the sign "Thonglor soi 8" , you will clearly see "Baan Pai." The Gent's Club is in soi sukhumvit 55. For more details, please call 0-2390-0197 , 0-6891-9431"
http://www.gentsclubhomespa.com/contact.html
I think there used to be..or still is..a massage place that was named Gentleman's also..in the next soi to Door Sauna...they used to advertise in Bangkok Post Classifieds.
Has anyone tried Manisa?
http://www.gthai.net/manisa/contact.html
It's on Petkassem soi 62/1 but looks very straight and uninteresting on the outside. It's advertised in gay sites.