- the rubbing and kneading of muscles and joints of the body with the hands, especially to relieve tension or pain.
- in sex or porn terms, a massage is often a rudimentary rub down of the back or legs used as a prelude to a sexual act, usually paid for.
Massage parlours are a common front for various forms of prostitution and paid sexual acts. The most basic and common of these is the happy ending handjob, sometimes more. Girls who don't want to be full on prostitutes often do this sort of work as it is more safe. There is also more wiggle room as to the legality of the acts, especially if the massage girl is never naked.
There are a number of porn sites over the years that have featured massage, such as Happy Tugs. There is also the more common theme of male masseuse who gives a woman a massage and then rubs her breasts and pussy to orgasm. This is a very common theme in Japanese porn, where culturally the women aren't as willing to stop what may not entirely be a willful act. Japanese porn often plays in the margins.