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What follows below can be found under the areas that deals with the sins of the flesh. You can also read our FAQ section under Lust, sins of the flesh, and concupiscence. The only time we won't struggle with these types of sin is when we are six feet in the ground. : )
Just encourage him to go to Confession on Saturdays.
It's easy and the priest is their to counsel us, not judge us.
You said: I have a nephew that says there is nothing in the Bible about living together, so there should be nothing wrong with it.
First, Catholic Christians don't solely follow the Bible but follow the teaching authority of the Church. This teaching authority is passed down to us both, (orally since 33 A.D.), and (in writing since 382 A.D. when the canon of Scripture was decided on), so just because there is no place in the Bible that talks about living together before marriage, doesn't means it's OK to do so!
Before ascending into Heaven Jesus instituted the sacrament of Matrimony.
Under Other offenses against the dignity of marriage, the Catechism states:
What can union mean when the partners make no commitment to one another, each exhibiting a lack of trust in the other, in himself, or in the future?
The expression covers a number of different situations: concubinage, rejection of marriage as such, or inability to make long-term commitments. (cf. Familiaris Consortio 81) All these situations offend against the dignity of marriage; they destroy the very idea of the family; they weaken the sense of fidelity. They are contrary to the moral law. The sexual act must take place exclusively within marriage. Outside of marriage it always constitutes a grave sin and excludes one from sacramental communion.
2391 Some today claim a right to a trial marriage where there is an intention of getting married later. However firm the purpose of those who engage in premature sexual relations may be, the fact is that such liaisons can scarcely ensure mutual sincerity and fidelity in a relationship between a man and a woman, nor, especially, can they protect it from inconstancy of desires or whim. (Congregation for the Doctrine of the Faith, Persona humana 7) Carnal union is morally legitimate only when a definitive community of life between a man and woman has been established.
Human love does not tolerate trial marriages. It demands a total and definitive gift of persons to one another. (cf. Familiaris Consortio 80)
Finally, let me refer you to an answer from our colleagues at Catholic Answers:
Sorry for the delay in chiming in, but here is my contribution. In the Bible having sex without benefit of marriage between two unmarried parties is called fornication, and it's condemned
in the New Testament, among other places:
that you abstain from things sacrificed to idols and from blood and from things strangled and from fornication; if you keep yourselves free from such things, you will do well. Farewell.”
But concerning the Gentiles who have believed, we wrote, having decided that they should abstain from meat sacrificed to idols and from blood and from what is strangled and from fornication.”
Being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity; whisperers
Meats for the belly, and the belly for meats: but God shall destroy both it and them. Now the body is not for fornication, but for the Lord; and the Lord for the body.
And lest, when I come again, my God will humble me among you, and that I shall bewail many which have sinned already, and have not repented of the uncleanness and fornication and lasciviousness which they have committed.
Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry:
