Moving together.

Do you think is a good idea that me and my boyfriend talk to my parents first about it? My parents and specialy my mother, dont like the idea of living together without being marry... she dont understand it and always says that is a sin to do that in God's eyes. She takes religion into this kind of topics, and for me is not a bad idea to live together, i know we will be marry someday. I want to make my parents to understand that he is the man of my dreams and that he cares about me. I told my boyfriend that if we want to make that step, i would like to talk about it with them, not to ask for permission but to let them know what we want and what we are going to do. That im not leaving them forever and that we will be marry someday. My boyfriend agreed and said that he will do anything to make me feel comfortable and happy and that he knows i care about my family too.