Does the Bible's word 'adultery' always mean sexual sin?
No. In 2 Peter 2:14, the phrase “eyes full of adultery” does not necessarily refer to physical sexual sin. Scripture often uses adultery for mixing paganism with true biblical truth, thereby adulterating the Word of God. False teachers are described as masters at this spiritual adulteration.
Les explains from 2 Peter chapter 2 that the chapter deals with false teachers in the last days. At verse 14, “having eyes full of adultery,” he points out that when Scripture uses adultery it does not always mean physical sexual adultery. Many times the word is ascribed to mixing paganism with true biblical truth, which is adulterating the Word of God. These false teachers are masters at that, fellowshipping with church people while filled with false teaching.
Having eyes full of adultery, and that cannot cease from sin; beguiling unstable souls: an heart they have exercised with covetous practices; cursed children: