Cum on body is normally shortened to COB in the sex industry. This is self-explanatory whereby the male ejaculates on their partner's body.
Nowadays this is a very popular service offered by escorts. Most will not let you have sex or receive oral without protection, but when you are near climax, they will allow you to remove the condom and release your seamen over their bodies.
In escort terms, this is not be mistaken for COF (cum on face) or facials. COB is strictly from the neck down and should always be discussed first. It is important that you don't ejaculate anywhere near the vagina as this could cause pregnancy or sexually transmitted diseases or infections, meaning that you might as well be having sex without a condom.
This is also not to be confused with OWO (oral without), OWO is a completely separate service whereby you are allowed to cum in the escorts mouth.
COB mostly follows PSE (pornstar experience) where a number of sex moves are performed and finished up with a climax on their partner, mainly breasts or bum. If you have a foot fetish it might excite you to cum on the escort’s feet. Again, this should be discussed prior to the appointment to ensure that the escort is happy for you to do so