A mutually satisfying relationship where both partners are giving and taking equally, allowing each other to be individuals, while at the same supporting each other's endeavors, and offering love and compassion.
Challbaby and I have a symbiotic relationship. Taking turns being each other's side kick.
The act of fucking someone up the ass while they fuck you up the ass at the same time, generally the reciever of the initial penetration doesnt enjoy it
The governments moneypenis screws every american every day whilst we stick our cocks in their ass, because they like it that way. also see Moneypenis (moneypenis and the symbiotic buttfuck, though similar cannot be used interchangeably)