New Defender's Study Bible Notes
7 like manner. The inhabitants of Sodom and Gomorrah became obsessed with sexual promiscuity, worst of all “going after strange flesh”—that is, blatant indulgence in the unnatural crime of homosexuality, including homosexual rape of visiting strangers (Genesis 19:4-9). The phrase “in like manner,” indicates that the sin of the angels was in the same category as that of the Sodomites.
7 strange. That is, “alien.”
7 eternal fire. The cities were destroyed by fire (Genesis 19:28), but its wicked inhabitants will continue to exist in everlasting fire (Matthew 25:41).