....St Thomas Aquinas reasoned that there needs to be two things present with intercourse: 1) conjugal love, and 2) procreation.
The lack of the former results in a loss of the loving aspect of the relationship while the lack of the latter results in a loss of responsibility.
I would recommend that you rad it rather than dismiss it. Aquinas was certainly one of a small handful of people who could be argued to be the greatest minds in all of history.