Sexual gratification of the woman often doesn't occur on the first encounter unless you really take a lot of time. If they're a virgin, which is common here, then they're usually quite ignorant and learning some very basics. Once they've "gotten over" this first experience, then they're generally more open to learning and foreplay. Sexuality is not discussed in the saucy Thai press in as much detail as in the west (never mind the saucier photos in Thai magazines), and in many circles it is not discussed in detail among friends, though many Thai ladies go into exhaustive detail with their close friends.
As you develop friendship as well as romance, trust, and lots of affection and comfort with each other, then you can often bypass the pitfalls of the above, especially with LOTS AND LOTS of foreplay.