Moralistic pontificating on sexuality without an inherent understanding that charity must accompany chastity every step of the way is counter-productive and potentially destructive. You can’t have authentic chastity without charity. After all, love is the essential dimension of healthy and holy sexuality.
Sometimes the most chaste persons are the ones who speak about it least, and when they do, it is humbly and sensitively.
Living chastely is very difficult. If you are preoccupied with trumpeting chastity isolated from the other virtues and the whole of Catholic teaching, you’ll be out of breath for the exhausting challenge of charity.
As St. Francis says, preach the Gospel, and use words when necessary.