Anal receiving is when the escort is willing to receive anal sex. It is important to understand what is and isn't acceptable with anal play, and what to do when it comes down to doing it. Each person is different, and what one person may love during anal sex could be very different from what another may like. The escort will need to communicate with the punter to find out what works for both of you, while also ensuring you both still have a great time.
With any type of anal play, you will need to use lube. While condoms do have their own already, it is best to use more. There are so many different types of lubricants available that there is bound to be something suitable you can use. If you aren't sure how much to use, there should be instructions on the packet, but as a rule of thumb, it is best to have too much and not too little. Anal play without plenty of lubrication can not only be uncomfortable but also painful, which can really ruin the mood.
Another thing to keep in mind is that going from the ass to the vagina can transfer bacteria and cause an infection, so if this is part of the meeting, change the condom first. You'll both have a better time because of it.
Whenever someone is penetrating the anus, don't try to dive straight in there. Instead, get nice and relaxed, maybe with a massage, and pay special attention to the bum. Use some lube and try just playing with the ass before the giver slips the tip of their finger in. If the passive person doesn't enjoy the feeling or wants to stop, the giver should listen to them. If they want to continue, try moving the finger a tiny bit by wiggling it, and very slowly see if it can slide further in. Over time the receiver will be able to relax enough to allow the penis to slide in, giving a nice tight sensation.