when I'm with my boyfriend I either don't put any on or whatever I have on from earlier that day. I won't reapply it or anything. But if we're going out with friends or such, then I'll put it on, and a little (I don't wear eye liner) very little eye liner. Hope that helps :)
I usually wear it when I want to go to certain places or meeting some important people.I wear it when I want to go to college,shopping,party,dinner,club and for sure dating.I seldom apply heavy makeup no matter on what function.I feel uncomfortable with those thick foundation,eyeshadow,eyeliner and all.Red lipstick is just to match with some of the outfits or the makeup that we put on.Some girls wear it to look more sexier.
A few days a week, just a wee bit. I don't think it changes too much when I'm in a relationship, it depends how comfortable I am with him. With the lipstick I'd just say she likes it and it makes her feel good :3