It's called Kapoo masage. It's kind of orgasm with hand.They massage oil into your skin. No you don't have to get naked And no it's has nothing to do with sex unless that's what you want.
oil! This massage is normally 50 to 100 Baht more expensive than without but still remains the same massage wise. Serious ladies will never ask you to take off your undies even the contrary: while the massage eg one leg they cover up the rest of your body.
A Thai oil massage is different than a regular Thai massage. Not only is oil used, it involves less bending of body parts than the normal Thai massage. You can get an oil massage for different body parts such as foot, leg, back, or a body massage. You don't have to get naked for any massage unless you go for a sex massage, and you'll know what to expect there.