1 Corinthians 6:18

18Fleeφεύγετετὴνsexual immoralityπορνείαν·Everyπᾶνsinἁμάρτημαwhateverὃifἐὰνmight doποιήσῃa manἄνθρωποςoutsideἐκτὸςtheτοῦbodyσώματόςisἐστιν,the [one]ὁhoweverδὲsinning sexuallyπορνεύωνagainstεἰςtheτὸownἴδιονbodyσῶμαsinsἁμαρτάνει.

Flee the sexual immorality. Every sin, whatever a man might do, is outside the body, but the one committing sexual immorality sins against [his] own body.