What does an egoless relationship look like? Romantic and Platonic. And what's egoless sex?
Is there a difference if the egolessness is coming from one side?
When you love someone, without ego, you just want their happiness. Even if that means leaving you. You place no hold on anything they do, and derive joy in their living their lives exactly as they do, no matter what that entails (setting aside, of course, behaviors which serve their appetites before the needs of others).
It is the same with the sex. You take joy in your pleasure, and also in giving the other pleasure, and in giving the other the knowledge that they are giving you pleasure. But you don't get attached to the idea of YOU doing that. You don't 'own' it, so to speak, setting it high upon a shelf with pride. The REAL you is the incarnating soul hanging out to witness it all.
And, in an egoless state, the self is perceived 'as other', and that changes everything right from the gitgo~