Do you have firsthand knowledge of this, or have you only “heard” about it? Having known the Work intimately since the 1970’s, I can tell you with almost complete certainty that this would never be done with 12 year olds. What surely is done is to encourage them to live chastity (which for them now at age 12 IS virginity). Most members of Opus Dei are married, so for them, virginity for life is neither practical nor possible. The celibate members at one time were allowed to make a commitment at around age 16, but that was raised to at least 18 years old a number of years ago.
It is possible that the beauty of the celibate vocation is spoken about, and in today’s society, that can be pretty shocking. However, it is a gross distortion to say that girls are swearing virginity for life at age 12 at these camps at the behest of Opus Dei members.
Betsy