Brian,

If youe clowns are tank raised (such as ORA) it may take them a while to figure out what they are supposed to do with the anemones. To answer your question, no, two clowns will host in an anemone, especially if they are mated. If one of them is changing into a female they should pair up eventually. I assume you do know that clowns are all born as males and a dominant male will turn into a female.

Gary