See where the word ALWAYS indicates IDOLATRY or PROSTITUTION?
According to Strong's Greek concordance, which you linked, πορνεία indicates
sexual idolatry within the context of
Revelation 14:8;
Revelation 17:2, 4;
Revelation 18:3;
Revelation 19:2, and
John 8:41.
"Another angel, a second, followed, saying, 'Fallen, fallen is Babylon the great, she who made all nations drink the wine of the passion of her sexual immorality.'" [Revelation 14:8]
"With whom the kings of the earth have committed sexual immorality, and with the wine of whose sexual immorality the dwellers on earth have become drunk." [Revelation 17:2]
"The woman was arrayed in purple and scarlet, and adorned with gold and jewels and pearls, holding in her hand a golden cup full of abominations and the impurities of her sexual immorality." [Revelation 17:4]
"For all nations have drunk the wine of the passion of her sexual immorality, and the kings of the earth have committed immorality with her, and the merchants of the earth have grown rich from the power of her luxurious living.” [Revelation 18:3]
"For his judgments are true and just; for he has judged the great prostitute who corrupted the earth with her immorality, and has avenged on her the blood of his servants." [Revelation 19:2]
"You are doing the works your father did.' They said to Him, 'We were not born of sexual immorality. We have one Father—even God.'" [John 8:41]
Also according to Strong's Greek Concordance, πορνεία indicates
fornication, i.e. sex outside of marriage, within the context of
Acts 15:20, 29;
Acts 21:25; 1 Corinthians 6:13, 18;
Romans 1:29;
1 Corinthians 5:1;
1 Corinthians 7:2;
2 Corinthians 12:21;
Ephesians 5:3;
Colossians 3:5;
1 Thessalonians 4:3; and
Revelation 9:21. Guess what these speak of?
"But should write to them to abstain from the things polluted by idols, and from sexual immorality, and from what has been strangled, and from blood." [Acts 15:10]
"That you abstain from what has been sacrificed to idols, and from blood, and from what has been strangled, and from sexual immorality. If you keep yourselves from these, you will do well. Farewell." [Acts 15:29]
"But as for the Gentiles who have believed, we have sent a letter with our judgment that they should abstain from what has been sacrificed to idols, and from blood, and from what has been strangled, and from sexual immorality." [Acts 21:25]
"'Food is meant for the stomach and the stomach for food'—and God will destroy both one and the other. The body is not meant for sexual immorality, but for the Lord, and the Lord for the body." [1 Corinthians 6:13]
Need I continue?