You didn't mention where specifically in Thailand your friend goes. In Chiang Mai, in my experience, the best you can hope for at the massage shop is manual stimulation. If you want intercourse, you have to meet later at your place or a hotel. I've never heard of intercourse as a feature of the massage itself. Also, the price for the aforementioned manual stimulation is from 1,500 baht to 3,000 baht, including the price of the oil massage itself. Your friend is getting off incredibly inexpensively if he is paying only 1,000 baht for intercourse. Could you tell us where he goes so we might also enjoy such a great bargain price?