BJ bars is a nice quick fix if you're horny
But your better off getting a nice part-time freelancer to your room and get the full experience.
Popular BJ bar is Lolita's on Sukhumvit soi 8 and there is also another BJ bar around the corner. Just search for "Lolitas bangkok" on Google maps.
Girls at BJ bars are usually 30+ (at least ��).