Young adults have forgotten what sin is.
I was amazed to find that most young adults do not think that sexual intimacy outside of marriage is a sin let alone a mortal sin. If that was the case then why did God give us the commandment not to commit adultery. (Adultery includes fornication, masturbation and all forms of sexual intimacy outside of marriage). So if God said it was a sin did Jesus waste his time and suffer and die on the cross for sin. Have countless others died to protect His teaching. What did Jesus say? "No fornicators, adulators and even those who lust in their minds will enter heaven" 1Cor 6:9.
Young adults say they do not want to hear this. They are tired of having this crammed down their throats. That is a rejection of the truth. The reality is that it is not enough to say "I believe in God" The devil believes in God and knows who Jesus is and can quote scripture very well as he did when he was tempting Jesus, Luke 4:1. Jesus himself said that it is not enough to do things in His name and say "My Lord and God" Because if you don't keep the commandments and do His will He will say to you "I do not know you" Mt 7:21.
If you truly love God then hearing this truth of purity would fill you with joy. If you are living a lie then you will reject the truth. No one wants something they reject crammed down their throat. So it is a rejection of Jesus himself and what died for and what He has taught us. That is the the lie of satin, he tells us our own desires trump those of Gods. This will only lead us to destruction.
If we really want to get to heaven we must first die to ourselves, that is to say, we must repent and live in the truth. To live in the truth is to find long term happiness. We must choose each day to do this. To live in a lie you may find short term satisfaction but ultimate despair, self destruction and unhappiness.