I have a little Love Bird called Sydney, and she used to have a mate called BB. They were very close, hooked up and laid a bunch of eggs. We suspect they were both females due to the number of eggs (which also never hatched) but it didn't stop them from otherwise acting like a couple. It was pretty cute.
BB died unexpectedly and for a while Sydney lived alone. She seemed OK, but I decided to get her another partner, so brought another young Love Bird from the local pet store.