If you ever go to someone's house and see a flower watering pot next to the toilet, you're seeing the other alternative to a bidet. My wife's family is from Iran, and that's what they use regularly. I find that pretty awkward, but wetting the toilet paper is a huge gain (best if your toilet is right next to a sink). Some companies have tried to market pre-moistened toilet paper, but requiring a special dispenser (and marketing problems) apparently haven't made it very successful.