Every day, multiple times a day. I spend a significant amount of time during work thinking about whether I'll have sex with my boyfriend when I go home, what I'll wear, and how we'll do it, or thinking about how the sex was the night before.
I don't get horny alot. But when I'm use to doing sexual things with a guy and it stops for some reason, I tend to think about it and want it. But when you don't have it for a while, I get use to not having it and it doesn't bother me.