If you want to go 24/7 and your Gf wants you to do just that, then you have a head start on others. Between the two of you if you can pass you can live the life of a woman. You will have to do all of the things a woman does all of the time as you will be trying to survive as a woman. It will be harder on you than on your Gf. You may want to get married before you take that leap