Threesomes?

Soo my hubby brought up doing a threesome about 3 yrs ago and at the time I was very insecure and immediately shut it down but now we're doing amazing and was curious if I should maybe bring it up again for our 7 yr anniversary present as I know he's always wanted to do ffm but I'd also like to try mmf.. I'm not into women but I'd give it a try . How should I bring it up if at all