Value is in the mind of the monger. My suggestion (as one who's done a variety of doubles) is to go for it. Every time I've spent more than I thought I should in this game I've walked away thinking, "That was worth every dime!"
Remember the wise man who said, "I spent most of my money on booze and fast women. The rest I wasted."

who are genuinely bi-sexual is much smaller than for other ethnicities, so those that offer doubles are most often "gay for pay', so you should not expect too much girl on girl action unless you are certain the girls you picked for this are into each other sexually.  In  other words, if you got sick and didn't show, would they still get together because they were ginned up for a little bisexual action and looking forward as much as you were to eating some pussy?

 
In my experience, most Asian doubles are just the  two girls doing  things to you, but not to each  other.  If you're okay with that, then its easier to find a double that will  fulfill this limited expectation.  One will sit on your face while the other one blows you, and then switch it out, or you will eat one pussy while the other girl rims you, and other similar combination of them both attending to you at the same time.  

 
I think I mentioned on another forum recently that out of about a dozen Kgirl and Thai doubles, only one pair was really into the girl on girl action, and it was super hot to be involved.  The girls that do these types of sessions without any bi- action love doing it.  They each do half the work they would normally  do in a session, but they each  still get paid the full session price.  What's NOT to like about that if you're a provider?  Lol   Odds are better in finding girl on girl action among American indies offering doubles.  

It'll make it easy when your flipping and swapping.And seeing that G on G doesn't float your boat, then you're easy...have a good time

MFF implies F in the middle having fun with M and F simultaneously. M might be doing K9 while F in the middle eats out F2. Or maybe M getting BJ from F in the middle while F2 fucks F in the middle with a strap on. It also allows for M.....FF which is M watching F on F action.
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FMF implies simultaneous 2F-on-1M action. Oftentimes, FMF turns out to be F.......MF and FM.........F : more of a tag team event.  FM go at it while F2 steps outside the ropes for a bit. Then, a switcheroo.  No or very little FF action.
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My experience with FMF was that it was tag team only. Fun for a bit but not worth paying double for the 0.5F + 0.5F = 1F net.  
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Are you interested in the F-F action? See if you can tactfully find out if they do that. Otherwise, expect FM..........F.  
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Good luck! Have fun!

I’ve done a few and it has never been worth it for me.  

There is a nice thrill initially in making out with one provider while the other goes down on you, but beyond that it always seems to end up with you and one provider engaged in one position, while the other watches from the side doing little or nothing.

I can definitely understand why many providers like doubles sessions.  It basically amounts to half the work for them for the same donation rate.

The key to a fully satisfying session would be to find two providers who are really bi and into each other. That can be somewhat hard to find however.

My first experience was with two lower tier providers and it was sensory overload.

Second time was with two top notch pros in Chicago.  We took it nice and slow which made it a great experience.  

So if the first time you walk away going WTF just happened, be sure to try it again as you will know what to expect.

COVID has put a damper on my MFM opportunities.  I hope that changes real soon.

... for me, at least. I did a count not long ago -- about thirty encounters with multiple partners -- many MFF threesomes, one MFFF foursome, one MFF tag team and about half a dozen orgy-like situations. When it came to the threesomes, many times I was in the position of introducing one of the women to the other.

Of the threesomes, only a couple were so-so and the tag team was interesting but not much to write home about. But all the others were delightful and when conditions are a little better and the bank accounts replenished, I look forward to more.

depends on a couple key factors ...    even if not into G on G .. and neither am I ..  the two girls have to be very comfortable with each other and know each other.    when it was just two providers random or two girls who work together but just available for each other ..  it wont be that much fun ..    

my last FMF  i took the girls out to dinner first,   broke the ice,  they got to know each other and click ... so all the mental foreplay was done prior to the suite ..   that way they were comfortable to immediately go at it once we arrived.  

i also suggest you meet each girl on their own first as well.    you need them to be comfy with you as well.    

and yes female condoms are almost a must.   either that or you all get tested  ( which i did with the two dinner girls.)

Like others, I've done a few and they were alright. The first few are always cool because it's a new experience. But the thrill of the experience goes away after a while. And finding providers who are truly bi and not "gay for pay" can be difficult. The one that I need to check off on my bucket list is MFM.

Tap into your Brain ie  the Ultimate/Universe. How do you believe WE can do this. We meaning Us. Doing this over and over Each. Experience. Is. New Experience. Different. ie Special.

Rock on

AA
(PS always seek the Irish. It is our thing......besides Church)

it is all about how you direct the ladies.  

Sometimes in 3somes I tell the ladies exactly what I would like them to do to me and to each other. If one or both ladies do not feel like what I propose we talk about what they do enjoy.

Sometimes I ask the ladies what they feel like doing.

It is always fun.

Been there done that, 3  or 4 times.   Glad I did it, but don't plan to do it again.
It does make you wish you had 2 dicks (or maybe 2 tongues) though

I've been fantasizing about doing a doubles session for a long time now, but then I've read on this site on many occasions that it wasn't really worth it

Since hobbying for me is something I can do only a mere few times a year as I have to build up spare cash, paying double the price for one doubles session is a big risk if I don't enjoy it. I'd rather have two sessions with my current favorite lady.  

I think MFM works better if both guys are BI.  less reluctance (even tho mostly hidden) to male to male contact while pleasuring the gal. Especially so in double penetration attempts.