Holly,
I believe the clergy are required to explain the scripture readings for the day. There is a great deal of your topics all over the internet, television, radio, etc. I believe if this was the regular fare being served at mass, people would be posting a thread, “How do I get my pastor to stop talking about …I want to hear more of the gospel.”
They can introduce the topic
lightly if it coincides naturally with the readings, but to hold an entire homily on this would be better served in a parish workshop. Most people who attend mass on a regular basis know right from wrong in connection with all of these topics. How could anyone be in the dark after Pope Paul VI’s Humanae Vitae was promulgated? We had an abundance of homilies on this. RCIA people will be instructed about Catholic teachings in this regard.
Here is the statement in the GIRM:
- The Homily is part of the Liturgy and is highly recommended,[cf. Sacrosanctum Concilium 52, canon law 767§1] for it is necessary for the nurturing of the Christian life.
It should be an explanation of some aspect of the readings from Sacred Scripture or of another text from the Ordinary or the Proper of the Mass of the day and should take into account both the mystery being celebrated and the particular needs of the listeners.[cf Inter Oecumenici 54]