... But I can vouch for the lady hobbyists here in LA.
(Btw that's pretty much just me, at least here on the boards )

Have to echo the sediment re a lot of couples. They seem to either be very easy and cooperative or a challenge to be sure. The challenges can result from guys trying to live out a fantasy and the wives are not really committed (or even aware). It's one of the reasons, we usually require the lady to speak with Tori before we confirm the appt...just to make sure she is aware...also helps to find out if there are any boundaries we need to be aware of.

I used to see lots of couples but lately I have had the same problems as well. Couples not wanting to give you real information. Couples being flaky and not calling back. Couples where the guy is calling in the middle of the night and it's in his wife or girlfriend and it doesn't know anything about it or or some couples think that they shouldn't pay the couple rate because only one of them is going to participate and the other ones just going to watch.   Couples can be tricky for sure but when you get a good one they're great I love couples

Is there any verbiage that you use, that you feel attracts more couples?

I've had similar requests, and when I let the person contacting me (so far its always been the guy) know I screen both parties, then things go silent.   Like others have stated I like to know the female is on the same page, and I also just like to know who Im seeing.  
In STL I saw this great couple, they both were on p411!  so if you are a serious couple seeking an outside source, (very ideal, no muss no fuss!) then at least having a p411 account would be a start...

I think a lot of couple inquiries that don't pan out or who get weird when asked for screening information are just single guys wanting wank material. I think the same goes for inquiries from women that are not serious as well. Very easy to hide behind the screen if it's a fantasy, unfortunately.

Haven't done the couples thing, but have done duos with Zooey...oh stop my racing heart.