God is quite familiar with our human nature and doesn't simply ask us to avoid the sins of the flesh. He also invites us to add the life of the Holy Spirit. If we focus on the "fun" our friends and neighbors are engaged in, we'll be extremely tempted to join them. If we instead focus on adding to our lives the fruits of the Spirit, we'll be too busy to participate in the acts of the flesh. Not that we won't still be tempted: we are after all still living in the day of evil. But the temptation will be lessened and we'll have the strength of the Lord available to resist all sins.