If you wish to bring an escort to your photo shoot (generally a good idea if you are working with a new or unknown photographer), this is something you should discuss beforehand.
Please be aware that most beginning and many advanced models have issues being comfortable posing for photographers in front of their boyfriends and relatives. Even if you do bring an escort, such as a friend or family member, you may not want them to be watching you during your shoot. This is something you should discuss with them beforehand — such as options.
If you’re under 18, you must bring one of your parents, or an older female model with you, to act as a guardian. Your parent or guardian must sign a model release form for you.
If you are just starting out, I suggest that after an introductory period and you and your escort are both confident that the photographer is reputable and isn’t creepy, that the escort leave (or at least monitor the shoot from a distance) for a period of time to allow the model to feel less self-conscious while getting used to shooting.
When working with any photographer for the first time, I’d suggest making a point of always having your cell phone handy, and to check in with someone you know at least once during a shoot to let them know you’re ok. Also make sure that someone you know knows where you will be and that they should expect to hear from you at a certain time. They should also have the number (and address, if possible) of the photographer you are working with. Again, this is just for general safety.