DEPRAVED
Tony manages to seduce, or is seduced by the demanding Huyen in Hanoi, then energetic Bui in Ben Tre, enterprising Tuyet in Siam Reap, and then the desirable Nicky back in Ha Noi. Nobody complained!
https://www.smashwords.com/books/view/626269
https://www.amazon.com/dp/B01DN099XM