Agreed. Communicate. Ask for it. Give it a name.
Then, give in kind. Ensure your passion, engagement and understanding of her desires/needs matches that which you seek.
On the other hand, I'd probably be as jealous watching it. Probably why I don't/won't watch a partner with someone else. Holds no erotic value for me.
Male, Straight, Poly
“Instead of getting better and better at avoiding, learn to accept the present moment as if you had invited it. And work with it instead of against it. And making it your ally rather than your enemy.”