Bidet

Some figures on toilet paper usage

We use 36.5 billions rolls of toilet paper in the U.S. each year, this represents at least 15 million trees pulped. This also involves 473,587,500,000 gallons of water to produce the paper and 253,000 tons of chlorine for bleaching purposes. The manufacturing process requires about 17.3 terawatts of electricity annually. Also, there is the energy and materials involved in packaging and transporting the toilet paper to households across the country.
Toilet paper also constitutes a significant load on the city sewer systems, and water treatment plants. It is also often responsible for clogged pipes. In septic systems, the elimination of toilet paper would mean the septic tank would need to be emptied much less often.
In Japan, high-tech bidets called Washlets are now the most popular electronic equipment being sold — 60% of households have them installed. In Venezuela they are found in approximately 90% of households.

Reference