All kind of erotic and adult works are jobs, that only a 18+ person can do, because it usually includes sexual services and in return, the client pays money or buy expensive gifts for the sexworker. A sexworker's service can include almost anything that you can imagine, but even adult job without sex eg. fetish jobs, femdom, massage job, hostess job, webcam job or dancing. And also it doesn't matter if you are boy or girl or trans or even your sexual orientation, because any adult person can be an escort or a sexworker. Don't forget, that the choice is always yours, nobody can force you to do sexwork! Usually we distinguish between incall and outcall erotic jobs, so for exaple the sexworker can work in a studio, private salon or brothel, or it can be outcall, so they meet somewhere with the guest, that can be a hotel, the client's house or anywhere else..