I'm with Nikki and Amethyst. I don't actually keep track of how often I get in the mood, but when the moment comes, it's usually several times a day or just a few days a week. When we're unable to see each other for one reason or another, I just end up masturbating alone.
And then there are times when I feel bloated and unattractive and too self-conscious and all that. When this happens I'm just not in the mood for anything, and it just makes me grumpy.