Apparently, top MBA seem to use BlackBerries for intensive sex-time-schduling. Just in case you haven't read this hilarious story, here is the URL:
http://www.businessbecause.com/lifes...r-blackberries
The whole point of the article is that some unnamed US researchers surveyed Ivy League MBAs and found out they'd rather skip sex for golf and fishing...
So, use their BlackBerries to make appointments as sex-time reminder for each other have been called upon.