The asians already got the answer:
http://en.wikipedia.org/wiki/Toilets_in_Japan
"Depending on the exact model, these bidets are designed to open the lid when they sense a user nearby, wash the anus or vulva of the user (including a number of pulsating and massaging functions), dry afterwards with warm air, flush automatically and close the lid after use."
Sure as hell makes toilet paper seem very very 20th century.