Conciously, I don't think about it much at all. Probably only when I get home from school. I do realize my subconcious is crazy though. For instance, how often my eyes find themselves fixated on a nice pair of tits or ass is staggering.
50% of the time. 65% when I'm hitting menstrual. Anything other than that is usually about writing, games, how to tell men to bug off, and thinking what to give my crush on special occasions without giving it away that I like her.
I never manage to think about just one thing at a time..
It will be like:
"god that girl looks tight. I wonder what the men in green tights from that Robin hood parody are doing now. Was actually robin hood a real person. Chocolate. What if time and space can be defined through the string theory,what will that do to einsteins theories?"
Or..
If I'm horny it will be:
*insert funky slap pop bass line*