Hi Ron what are the BJ bars called ? 
The best one I went to from personal experience was Lolitas, but I must say the girls are all mid-looking roughly (4-6/10) and slightly older but I had the best throat experience from this mid 30, slightly chubby girl in a school girl uniform, she was so sloppy and let me put my hand on the back of her head and facefuck her relentlessly till I cummed and she spat it in a tissue. Took place on a sofa behind a curtain, multiple curtained off areas in the room.
Others I sampled and had great experiences;
- 7-heaven, modern and iPad set up - can be a bit of a queue
- Dungporn
- Wood bar (not real lookers but Mamassan very accommodating, brought out a line up of about 15 girls and asked what I was looking for - ‘balls deep sloppy head and cum in mouth’, handpicked 2 girls for me to pick from - picked a slim Thai, mid 30’s, small tits but killer eye contact during the head.
All girls rotate regularly at all the places (as in line ups refresh).
Lolitas in closest bj bar to Novotel/Ibis on Nana Soi4 area.
I would also highly recommend, I think it’s called Analisa massage BKK - about a 1-2min walk from the hotels mentioned above - had a milking table in all room (a hole for your face and a hole for your little man on the table - eg; a hole for both heads) - I had 2-3 massages there, a 4hand massage also - great service.