Very good advice Momoko. I was also thinking maybe you could volunteer for an agency involved with children - at least you could share the love you have in your heart with children who desperately need it - you might meet someone.
I know most dating ads would discourage revealing you want children, but I wonder if you were to be honest and say you're looking for a long term relationship and want to have children - would there be guys who also want children too? I could be way off since I'm not familiar with the dating scene.