A concept design from Hitachi is claimed to be able to track a user's activity with a great deal of precision.
Taking your phone to bed has up until now meant answering e-mails and working until it is time to shut off the lights. Not anymore. With the new iPhone Passion application your lovemaking can be rated on a scale from 1 to 10, or "bad" to "perfect". By strapping the phone to arm or belt, users are rated on duration, activity and climax.