I never saw them as a duo but I saw Bianca on multiple occasions. She was an incredible lady, truly one of the best people I have meet in my travels into NYC.

I saw her one-on-one. She and Rob weren't in business long. Regretted not being able to have fun with the two of them.

Together they were fantastic! Wish there were more couple providers out there like them they took my curiosity to new heights

I have very fond memories. My first MMF. They pushed my limits and exposed me to an ecstasy I couldn’t have imagined. No one could match, but I wish there were more similar providers.

I just came across this Profile:
http://www.theeroticreview.com/reviews/bentley-marie-and-dylan-4803815771-289706
Bentley Marie and Dylan
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http://bentleymariearizona.com/americas-bi-couple
America's Bi Couple, Bentley and Dylan
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Bentley tours but I don't know if they tour as a duo.

Bentley and Dylan - I think usually she tours alone b/c less demand for duo - though at least on one occasion he came along- I chickened out and just did a solo - he came in after session and the three of us hung out for a few minutes and chatted - they were cool - I should have done the Mfm

We will make your fantasies come true!

While I have not had the pleasure of meeting Bianca & Rob, I read most of their reviews. I’m happy to report that I may have found a suitable replacements for those interested in MFM.

Thank you for the shout out! We do tour together.  You are correct though, we need pre-bookings and he can only join on his days off, but he was just with me this week and is joining  me in Boston  next week.  

I just came across another MF duo ad. DISCLAIMER: I do not know them. I know nothing about them. I can't see their other website because I'm using a VPN and it's blocking me. I do not see any mention on the Philly discussion or ad Boards. Do they travel? I don't know. But here goes:
.
http://www.slixa.com/pennsylvania/philadelphia/m-and-madame-smith
http://www.mrandmadamesmith.art/ (Couldn't connect: "403 Forbidden")

Incredible find!

I finally connected to their website and they have a P411 link to Lola which confirms what you said.
.
And I now ASSUME that they do travel based upon this (on their website):
"... As ardent voyagers, we are not limited by a schedule, nor by time and space.
We traverse the globe, seamlessly migrating from one bustling metropolis to another, savoring the symphony of diverse cultures. ..."

Just posting another MF duo find on the NY Ad Board. DISCLAIMER: I do not know Audrey (Amour) and Jesse. Audrey has reviews but I don't see any Audrey - Jesse F - M Profile with reviews. Anyway, here's the info (trying to keep things all in one place under this OP). Audrey Amour lists Jesse as a friend on her personal (solo) website, so it's the same Audrey:
http://www.audreyamour.com/friends
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Current NY ad: http://www.theeroticreview.com/discussion-boards/new-york-ads-88/visiting-manhattan-7-17---7-21-one-of-a-kind-m-f-couple-experience-88060
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Audrey - Jesse, NOLA couple:
http://www.naughtynolacouple.com/
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Audrey = Audrey Amour, TER ID: 295887
http://www.theeroticreview.com/reviews/audrey-amour-5045008620-295887
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Audrey advertises on other TER Ad Boards, e.g.,
http://www.theeroticreview.com/discussion-boards/louisiana-ads-79/blonde-girl-next-door-gfe-petite--sweet-8391
.
Maybe someone will find out what the Audrey-Jesse experience is like and create a Profile and post their review.

Adding to the list:
http://beautifuldirtycouple.ch/
I don't see NY on their current schedule.
http://www.theeroticreview.com/reviews/show.asp?id=130649
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http://www.youtube.com/watch?v=nlJugdk4OGc
Oliver! Oliver!
Never before has a boy wanted more!
Oliver! Oliver!
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I think that they offer observing only, no MMF or MFM participation.

Correct, Chloe and Oliver is the "lite" experience, as you are limited to watching and very YMMV light touching instead of being able to participate. I had a session with them years back when they were in NYC, and thoroughly enjoyed it. They make you feel at ease, have great chemistry together, both have absolutely smoking bods, take direction very well, but you'll be getting yourself off.

Been there done it - not as good as the real thing!