mention of jedi celibacy as far back as may 1974 rough draft:

Montross goes back to his station and a few moments later, Starkiller is paged over the P.A. system. The general waits, watching the big board. Eventually, Starkiller stumbles out of an enclosed computer closet, fastening his pants and tucking in his tunic. A moment later, the cute female aide rather sheepishly exits the computer closet. She is also in the process of putting her uniform back together. Starkiller rushes up to the general and snaps to attention.

The general lets him stand there for a moment, not acknowledging his presence; then, suddenly, without warning and in one masterful flash motion, the general stands, grabs a small baton attached to his belt (which immediately ignites into a four-foot glowing lazersword,) and swings at the young warrior's head. In an equally quick movement, Starkiller ignites his lazersword and blocks the general's blow. Everyone in the war room is surprised and startled. After a moment, they rush to the general. Starkiller and the general stand motionless for a few moments, with lazerswords locked in mid-air, creating a low buzzing sound. Finally, the general grins, and Starkiller hesitantly relaxes. They lower their swords and turn them off.

GENERAL

You are trained well, but remember, a JEDI must be single-minded, a discipline your father obviously never learned, hence your existence. Clean yourself up. Discipline is essential. Your mind must follow the way of the BENDU.