Thanks for the Karma - it was a very nice surprise! I wonder if I get more for this post
As JeSun pointed out these terms are most likely Cantonese specific however I think that a majority of the walk in WGs would understand since some of them;
1. are local HK girls
2. have been in the business in HK for a period of time
3. they advertise these services on websites, magazines, signs etc
4. they get taught these terms by the pimps (I don't know about this one just wanted to add it in )
5. they get taught these terms by the bros
6. they get taught these terms by their colleagues
If the WGs are from mainland China then they may not know but they should be able to read the terms in Traditional Chinese. If they can't then I include below the Simplified Chinese version. Whether they understand it - is another thing. But it will make a very good conversation starter as you demonstrate it to the WG
I have also included the actual meaning of some of the terms in Simplified Chinese - just to make it a bit clearer for the WGs if you were to show it to them I have added a few more onto the list (extras for you bros)
做爱: Make Love
吹萧 (吸吮陰莖): Blow Job
出火(手交): Hand Job
69互舐 (69式): 69 position
舒服保健: Massage
夹肠仔: Boob Job
毒龙钻: Poison Dragon Drill
口爆 (将精液射在凤姐口内): Cum in Mouth
顏射 (将精液射在凤姐面上): Cum on Face
制服诱惑: Uniform Sex
后花园 (肛门性交): Anal
性虐: S&M
水中萧: Water Blow Job
吞精: Swallow Cum
限时任做: Unlimited Shots within the Time Frame
孖Q (即完事后再来一次): Two Shots per Session
过夜: Stay Overnight
男對女口交: DATY
深喉: Deep Throat
舔肛: Ass Licking
指交 (用手指性交): Fingering
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I wonder if I get more for this post 
)
I have added a few more onto the list (extras for you bros)