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St. Thomas thought that "simple fornication, which is committed without injustice to another person, is the least grave among the species of lust." (See here.) Earlier, however, he wrote that "nothing but mortal sin debars a man from God's kingdom. But fornication debars him, as shown by the words of the Apostle (Galatians 5:21), who after mentioning fornication and certain other vices, adds: 'They who do such things shall not obtain the kingdom of God.' Therefore simple fornication is a mortal sin." So we're still bound to celibacy if we can't get married. The more you lament it, the harder it becomes to bear. And, anyway, if you don't plan on getting married, I think it's especially unwise to awaken an appetite that may not easily be satiated.