No woman wants to mother a man. It's a guaranteed attraction-killer. She needs to feel secure and protected by YOU, not the other way around.
Also like others mentioned, no woman should be put in the same league as your mom. A parent's unconditional love should NEVER be confused for romantic love - the results are always disastrous.
If there is any member of the family she should be treated like, it's your annoying kid sister, and sometimes your daughter when she needs to be spanked.
Really though, what's up with the incestuous analogies? Is this really working for anyone?
Usually, just treating em like women I wanna f*ck works for me *shrug*