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Make sure that everyone is actually interested in it and not a "for you" kinda thing. Like make sure the females are as hot for each other as you are for them (or whatever the gender/person setup is).
Also, wait a week. Actually contemplate if this is purely for your satisfaction, or something everyone wants. If it's a "gotta happen right now", don't do it in a relationship. If it's a hook-up, use your own discretion as you probably already do with partners.
Why aren't we allowed to be interested in our own experience?
Not the OP but I don't think that's what they're trying to convey. Definitely make sure you're getting what you want out of the situation as well but also make sure everyone else involved actually wants to be there and is interested in everyone else. It's also possible that you can enjoy a three-way where two of the people are mainly just into the third person but everyone still should be comfortable and happy with what's going on.
I guess just make sure everyone knows they're free to speak up if something gets uncomfortable and make sure any boundaries are clearly established beforehand. And have fun! I highly recommend being the foundation of the Eiffel tower.