What the Bible Does NOT Say About Premarital Sex

[Angrboda]

I’ve not found anything. Zip. Zero. Nada. So from where do Christians get this idea that no premarital sex is a moral absolute?

Revelation 21:8
But as for the cowardly, the faithless, the polluted, as for murderers, fornicators, sorcerers, idolaters, and all liars, their lot shall be in the lake that burns with fire and brimstone, which is the second death.”

Revelation 22:15
Outside are the dogs and sorcerers and fornicators and murderers and idolaters, and every one who loves and practices falsehood.

The word translated here as fornicators is pornoi/pornois, which is elsewhere translated as the "sexually immoral." It doesn't specify what type of sexual immorality and indeed could be a reference to homosexuality. The verses you've chosen are inconclusive.