Opus Dei is still the RC church's lone personal prelature, and thus does not qualify as a lay organization.  The lay membership is formed like clerics, and act like clerics, and celibacy is imposed as a condition of membership, NO exceptions!  The personal prelature designation is a clerical brand on persons not recognized at canon law as clerics!  That was the brainchild of JP II, and the sooner it goes, the better for the church!