IMO, the ONLY time a person should let a girl live with them that they're romantically involved with, is if you are engaged to them to make sure you two are compatible living together before taking the big plunge. Otherwise no other reason. My $.02Just sayin that things have to go really well for a few years that i would let a woman move in and then there is no guarantee that things wouldnt change to the worse once she is in. Its a risk to take that step and the reward isnt that high for the most time.