Yes plenty of providers entertain ladies & couples.

But I never trust the provider profiles here on TER since they aren't filled out by the provider herself and often have  outdated or flat out wrong info. Always check her personal website, and if you can't find any mention of it, shoot her an email.

I've seen many and we've had loads of fun. It helps if your provider is truly bi, so read reviews if you can!  

Make sure the provider you contact knows that both parties are comfortable with the decision. Most couples who contact me send an email with a little introduction from each of them, and that ensures me they are both equally happy and excited about the experience. Remember to not include graphic language or references to sex in your communication. It would help if there were a search option for this. But if you purchase VIP you can message people here about providers who see couples.

Have fun!

I almost always ask to speak to both parties over the phone before I'll entertain a couple.  I generally want to know that she is aware of who I am and that she is okay with / into the situation.  I don't do "surprises".  I've met with couples where even though it's clear she is doing it to please the guy, she still sounds fun/game, and we've all had a good time.  Sometimes I surprise the ladies by showing them a much more fun time then they had anticipated!  

It'll go much better if you two browse TER together and find someone you both like. If you both make the initial contact its much easier for us. I absolutely will not see a couple for the first time without talking to both of them first. There has been more then a few times I've had the man contact me then he says something along the line of "let me make sure my wife is serious" and I never hear another word. I love couples, but both of you have to be into it. If you plan it together chances are she will be just as excited as you.  
I also prefer at least 90 min appointments, I like to have time to visit and get to know everyone better first. I want enough time for everyone to get more than enough attention. An hour is not really enough IMO.  
Finding a provider who is really bi will make a big difference, even if your wife isn't interested in REALLY diving in. If the provider is into girls your wife will get more attention and feel like she is as much of a focus as the man is. I've seen straight providers all but ignore the wife and it ends up being like both of the women are there to take care of the man. Which usually doesn't leave the wife too satisfied. Even if the point is to fulfill the mans fantasy chances are the wife will enjoy it a lot more and want to do it again if she feels special.