Most Helpful Girl
It really depends on my mood. I'll usually wear a bit when I go to university, and more when I go out. Day to day I don't wear any.
I imagine I'd do the same when I have a boyfriend. I'd hate to wear makeup often, then have him see me without any and be like, "ARGH!" This way he knows what I REALLY look like :P
Red lipstick could mean everything or nothing. More likely the latter. Sometimes I'll wear it just cos it's fun to put on.