I really really like doing doubles appointments.  
I find it extremely exciting to have two people to touch me, and two people whom I can touch.

And it depends on what a guy is really seeking.  

My first doubles appointment was with two ladies I already knew separately, so when I found out they also knew each other, I was confident we'd have a good time. And it turned out to be a fantastic session. Any concerns I had about not knowing what to focus on/being overstimulated were unwarranted.  

That's far from the case for most of us.

I have had dozens of threesomes over the years, even a foursome, but very few of them were "all that"

Also some guys are looking for different things from a threesome than others, some guys are thrilled just to get a lesbian show, or want it to be "all about him" and some guys are somewhere in between.

I find myself much closer to the "all about me" camp and I don't really enjoy interacting with a truly lesbian couple, I've done it before and felt more like a spectator than a participant when the ladies are "too much" into each other, to the extent that I start getting ignored.

I also hate stopping to change condoms, it seems to take away the debauchery of the experience, Female condoms are a decent solution to that problem IF of course you can find two FC friendly women.

IMHO threesomes are OK, but overrated as far as I am concerned. although I do have some fond memories of a few outstanding ones. One was my very first threesome with two civvies, well before HIV was a concern, two hot teenagers (I was only 17 myself) six hits of acid (two apiece) and about a twelve hour blue of sex. Almost forty years later and thousands of women, and I don't think I have ever topped this experience, but those days of drugged up, no consequences, bareback sex are unfortunately a thing of the past.

A fucking disaster. I was really into the one girl, but could care less about her girlfriend. She kept interfering and trying to insert herself, the hot one I really liked kept trying to engage her friend, I'm looking and groping around like WTF. In the end it was like the Three Stooges having a circle jerk!  

In no particular order here is how several of those BDSM sessions went:

It's easy to get distracted, and not know what to do first.  But it's definitely great with two gals who are into each other.
The last one I did was an MFM.  Now that was REALLY distracting!  Might do another.  Not sure.

My very first session with providers was a threesome. It's something I'd fantasized about. I was already nervous about just having sex with any woman after being married so long, and having two just made me more nervous. I should have waited until I had more P4P experience. I'll do it again someday, though.

The only anxiety I have had is whether I am really athletic enough to really do it right. A DP with one girl using an SO takes a lot more work than you might think.    It takes some real leg strength and endurance.  With one girl - you can get some rest and some pauses - you can get into a very nice sort of rhythm.  With two providers - something is always happening.....  

I have showed up to meet someone and he already had a provider there that I had never heard of let alone had any chemistry with , not good.

He could be as sensitive toward "women" as he wants.

Sure it can be a little intimidating to have to be able to perform with two women but of all the doubles I've done I've never once felt judged by the ladies.  The only 3somes I've had that I didn't thoroughly enjoy were those where the ladies were not comfortable with each other.  And as for me a key n part of every 3some is watching two hot ladies get it on.  So if you really like doubles more power to you.  And me.

If any of you guys out there are on the fence, go ahead and try it! It's REALLY spectacular to have an additional pair of hands/boobs/ass/mouth working you over. I'm guessing that the greatest concern for the inexperienced is about too much happening at once; I've found that it works best going in a kind of circle where each participant has a turn having two others work him/her over. As for the performance concern, it's kind of nice to be able to tap out and take a break without stopping all the action. Like any P4P appointment, you should feel empowered to establish a pace that's comfortable for you.