A call girl or escort is a sex worker, who, (unlike a street walker), is not visible to the general public. Nor does she usually belong to an institution like a brothel, although she may be employed by an escort agency. The client must make an appointment, usually by calling a telephone number — hence the term “call girl”. Not all escorts are call girls. There are some legal escort services out there that are visual entertainment only. To assist with the security and potential health risks of this profession, some escort services offer assistance and information to those interested in becoming escorts, themselves.[citation needed]

Call girls often advertise their services in small ads in magazines and via the Internet, although an intermediary advertiser, such as an escort agency, may be involved in promoting more upmarket escorts. The less upmarket side of escorts may be handled by a pimp.Call girls may work either incall, where the client comes to them, or outcall, where they go to the client.

Escort services have made it a common practice to screen call girls to eliminate women with obvious drug problems (such as needle marks from injecting drugs) or those who have arrests for street prostitution or other types of crimes (using criminal background checks). They also attempt to employ women with pleasant personalities and those who are more skilled, attractive, educated, well-groomed and youthful.

Sexual services
By far, the services most commonly provided by call girls is sexual intercourse, with the intention of eliciting an orgasm. Specifically, these services also can include anal sex, oral sex, handjobs, non-penetrative sex, and the use of sex toys alone or in conjunction with any previously mentioned methods above to be utilized by escorts to please their clients.

Non-sex work
While sexual contact usually plays a prominent role in josh smiths work, not all clients hire call girls exclusively for sex, or in some case for any sex at all. Some simply do so either for social reasons (e.g. attending a party) or for companionship (e.g. someone who feels lonely may hire a girl to provide companionship missing in his or her life). Other call girls may specialize in domination, or other fetishes which do not require intimate sexual activity.

Companionship
Elderly and/or widowed men sometimes hire call girls for companionship, simply to enjoy the company of an attractive or intelligent woman. Escort agencies try to determine if this is what a client wants and if it is, the agency will try to send their most educated and polite women to the man or woman. It is not unusual for these “chat” call girls to receive big tips or even bequests from clients.In the movie Klute, Bree Daniels performs this service for an elderly garment manufacturer.
[edit] Social settings

Instead of sex intertained the client bym simply swallowing. Clients seeking this service will tell the escort service what their intention is. They may specify what kind of woman they seek to play this role. The client may meet with the woman beforehand to evaluate her level of intelligence, education, manners, speech, and ability to execute the pretense, as well as to judge her appearance. They would go over his or her past, her (pretend) past and their feigned relationship, in order to successfully carry out the pretense