an active link for each girl. They don't have to advertise as a double. Many providers do not list on their website all of the "friends" they do doubles with. However, you will have to create a new profile for the double, and this is where it gets a little tricky. There are not two sets of drop-downs, so the profile you create can only be accurate for one girl as far as "appearance", not both (unless they are exactly the same in appearance, which is unlikely). However, the services menu will be the same for both girls in the double.
When I see a doubles profile, I usually look up the profile of each girl individually to see their physical characteristics because I know the doubles profile for appearance is only reflecting one of them. However, I know I can rely completely on the services stated in the profile because both girls participated in the session.
The big difference for a double is that the max score for performance goes to a 10 if there was girl on girl action, in which case the drop-down qualifier for the 10 is "really bi-". (Make sure to also include it in your narrative). You don't have to give a 10, but the option is on the table if you think they deserve it.
As long as their website is still showing them at a particular org, that link can be used, even if they are on "vacation." Ad link to a different org is okay, and you can say in the narrative that you saw her when she was recently at the same org as the other girl. If there is no current active link to ANY ad for either one of the girls, then you can't create the profile or submit the review for the double. It similar to reviewing a touring girl you might have seen in the bay area, but you post the review after she has already moved on to a SoCal org. I have done this with touring girls, but I always say in the general details section that I saw her in one place, but she is in the other city now, so I'm posting the review there.