Stressed.

Hi, I just need some advice from same sex/bisexual couples, I'm currently in a relationship with a female (both of us are bisexual) we've been together for almost three years and we both want children. I'm also Polyamorous but that doesn't sit right with her. I want to have a baby the old fashion way, and she would rather me use a sperm bank. Anyway, I'd like to know how some of you got through this hurdle.