In reply to a post on r/DaystromInstitute:
See also this blog post: "From The Ensign’s Lounge: Drunken Starfleet Rants, RULE #23: There is no sex on the Holodeck."
http://usslomaprieta.tumblr.com/post/61558903050/from-the-ensigns-lounge-drunken-starfleet-rants