Nah, nothing like that, i would never willingly get involved in an exclusivelly monogamic relationship.

What happens is i let my friends and family play with my N900 somtimes and i would rather not have them accidently stumble on my "adult" conversations and things like that. I already use two differents email address keeping that in mind, but it's quite annoying to log in and out and use the webmail client in general, and i enjoy the simplicity and integration of the default email client in the N900.