There are many of us that see couples and are interactive with the female.  When you search reviews check the section that states whether a lady is bi.


xoxo
SJ

Have your wife choose a couple of ladies she is attracted to, and then contact the provider's to see if they entertain couples.

Anyone can recommend a provider that will see couples, but your experience will be better if you search for someone you are both attracted to first and foremost!

So in the search function, select "really bi" and any other criteria you have like age, ethnicity, etc etc