I've been a few times now - albeit infrequently, maybe once a year for 4 or 5 years. First time I saw Pimon and she was great.
Second time asked for Pimon, was told that would be OK, but they sent a totally different girl in to the room! Didn't mind 'cos she was cute and gave a great service. Judging by the website they had at the time I would say it was Nicky who I actually saw. PM'd Pimon on A/W for an explanation but received no reply.
Third time saw Joy. An absolute knockout girl, both in terms of looks and service. Unfortunately she left a while ago.
Most recent visit was with Dee. A nice enough lady but fairly routine service.
There is something about the old shared bath/massage/FS experience that I find incredibly erotic when the mood takes me. I would be a regular at Thai Sanook if they had a reliable rota and proper website. The website has had a makeover recently but is still rubbish.
To answer the 'anal question' posed by mnbvcxz, I doubt it but guess you would need to ask on the day. I have read a fair few reports on various forums about Thai Sanook and none of them mention this being on offer.