In fact I have heard such homilies. In the first instance, I was attending a Mass in Coldwater, MI, where the pastor (relatively young, as priests go, graduated in the 80s,) discussed how the Catholic Church was not a cafeteria, where we could pick and choose, but like Sunday dinner with one’s parents, where one must clean one’s plate. Specifically, the priest referred to contraception as wrong. The next week, he repeated his message, discussing contraception at length, commenting that we probably have not heard a priest, let alone a bishop, deliver a homily on contraception. In addition, the pastor said that he is not afraid to teach the hard truths of the faith, and that he is not running some kind of popularity contest.
In the second instance, I was present at a Mass televised on WNDU (Notre Dame University’s campus television station.) There, the priest (who had graduated in '39), in discussing the story of Jesus and the Samaritan woman, alluded to various sexual sins, including contraception.
Ryan King