“Doesn't do extras” refers to terms agreed upon between a client and an escort service provider. When the escort “doesn't do extras,” it is implied that they will not do anything outside of the terms – even when things heat up with the client. This is hard to negotiate when rendering services. It needs to be discussed before contracting the escort.
More About Doesn’t Do Extras (DDE)
“Doesn't do extras” needs to be made clear from the start. It protects both the client and the escort. The client knows the limits and can ideally keep within them. They are aware of where things will go. They can keep expectations in check. On the escort's part, it lessens the risks of harassment while clients remain happy.