We have been with others, like foursomes and group sex.
Currently: Being my wife is not bisexual, she avoids the orgies. When meeting a couple she prefers separate rooms.
The reason: She likes to spend time making it with the male half. I, on the other hand can be done in a lot less time.

It is so hard to find couples that will accept her limitations, we have invited single males into our bedroom.
That seems to fulfill my interest for diversity and she is treated to a variety of sexual partners.