Get your mind out of the gutter! :)
I started putting screw-lube (paraffin?) on my screws before using them (from Rockler). Wow!! Huge difference. They go in like butter now. No more breaking the heads off of screws (this was not intended to be a buy better screws thread, so...) I use it every time now.
Just a little tip to those in the dark and a big Why didn't anyone tell me? to everyone else!