Sorry I've been absent for a few days....
They were married sometime between the old series and the second one....{the little tv movie/mini series that they tried to turn into a new series...."Brady Brides"... it didn't last very long}....regardless of how tacky they were....ie...A Very Brady Christmas...etc....those would be considered cannon, since the characters and base story line remained the same....attempts to pick up where they left off....just not done very well.
The more recent feature films, that were for the most part parodies of the original series, of course don't count for anything....but I'll respect your Brady OS purism.....so yeah, at the end of the first series, Alice was still a virgin.
