The other reason why lovelife can come to predominate a private diary is that it's often harder to talk to friends about, because they're likely to know people involved.

I've no suggestions on the maths, though am intrigued; I think most people have similar patterns but haven't graphed them :) But will reiterate a comment I think I made before; perhaps the wise thing to do is try to *change* the distribution, so you have a more balanced record of you feelings :)