I've been noticing them too but I am a bit hesitant to book it because most of them were unreviewed and a lot of the ads are low quality.
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I've had some TS threesomes in the past that were ok. One was with a couple that used to be in NY but hasn't been there in years. They were a pretty good time. I saw another duo that travels and are well reviewed that was ok. I had thought about seeing TS Aurora North and TS Supreme when they advertising as a duo but they broke up before I got the chance. Other times I've been offered a threesome with someone else in the bathroom and I've always turned that down.
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I'm pretty picky these days and most of the threesome ads just don't meet my booking criteria. I've considered doing one with TS Monica, who advertises threesomes when she travels with Steph Koleman (I think her name is?). Other than that I've been keeping an eye on TS Kylie TER ID: 375490 who offers threesomes TER ID: 400037.

I remember back when it was my very first time being with the T-Ladies.  The first time I actually ended up with 4 of the ladies.  After they got in the car, we went to a No-tell-hotel.  3 of them participated.  The 4th one sat off to the side and watched TV.  That was okay, but ever since than I don't think I ever even went with more than one at a time.  Though there was a couple places where I went with 3, one after another.  1 place was in Spain and another was in Colombia.  That first time was in Panama City and had to use body language.  I've been learning ways to get around foreign language barrier.  I first used dictionaries, then computers and other electronic methods.  
You all have a Merry Christmas!

It's a sort of bucket list item for me: two tops having me in a sandwich.
I kind of think that the fantasy likely outthrills the reality, but I'd like to give it a go.
(I'm thinking Vegas, California Cutey + some other tall, busty top, but I don't even know if she does that.)

Per my most recent review, I kind of had a duo, but as one of the most disappointing dates ever, I don't count it for The Record.

tag teams

The way it usually works is the one who's hotter and getting calls asks if the less hot one can join for the same or more money. I've taken them up on it a few times. Usually, it's a letdown. But I have had times where it's been truly great. There are many recent arrivals from Latin America on the pages lately that just want to make a quick buck and don't care about return visits, so it's a YMMV situation. I've had more success seeing 1 of the girls individually first, then seeing the duo (or trio) on the next session. I can sus out BS that way without blowing extra dough.

There's a little group operating out of O'Hare recently that I've been considering....

Best duo around. Will fullfill all those 3 some fantasies. Its about a grand but well worth it.

probably for most it's a way to save on hotels, lol.
one duo that is real good (pricey though) is the Asians out of  LA, Taylor and Rita. both are great girls and friendly and they work well as a duo. i prefer 1on 1 though most times.

Tried once, the second girl was a disappointment so I sent her packing. I do have a couple girls on my bucket list .love to read some reviews before I venture out again.