I'll be in Hong Kong (Asia, not Tijuana) a few times a year. I'm aware of the 141 walkup joints, but I'm looking for more higher end girls to come to my hotel. There seems to be so many agencies, but no site that has reviews, so it's hard to no what's bait and switch and what's not.
I've actually had good luck with the ladies inside the hotel bars were I was staying. Woobar in the W and Ozone in the Ritz. I also remember there were tons of women in Macau if you're planning a day trip there.