Should sex before marriage be encouraged in Christianity?

Answer:

"Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God" (I Corinthians 6:9-10).

Fornication is sex between two unmarried individuals. Therefore, the answer is: No. Sex before marriage is condemned in Christianity.