“Finally appear the sin regarding not watching suitable means of copulation, that’s a great deal more grievous should your discipline connection the fresh new ‘vas’ than simply when it affects the manner out of copulation according out-of other items.” (Saint Thomas Aquinas, Summa Theologica, II-II, Q. 154, post 12).
If a partner food his girlfriend lustfully throughout the sheer relationship connections, the guy sins. But he commits a very grievous crime, called by St. Thomas an abuse, in the event the he sins of the committing unnatural sexual serves (we.e. playing with an abnormal part of the body once the a ‘vessel’ to own intercourse). Right here St. Thomas explicitly (in distinct vocabulary) condemns the latest sin of unnatural sexual acts inside relationship.
2nd, it is clear (in the quote out-of article 8 more than) that St. Thomas taught you to definitely a married partners isn’t justified from inside the committing one sexual acts at all in this matrimony.