So it is appropriate for the CEO to essentially pout to him staff that he can't have sex with them?

All of these things are certainly in the employment agreements and HR guidelines at Uber, this memo is NOT the first time any of these employees have gotten this 'advice'. Further, but putting this content in the memo you are doing a couple things: First, setting an expectation that sex will occur at this company endorsed function; and two, second you are essentially saying that your employees have had problems with this historically. How do you think that makes you employees who are not interested in this type of thing feel? What about those that just want to have a good time with their coworkers without being propositioned by every horny drunkard in the room?