Guys, I'm really not happy with some of these posts in this thread, some are close to heresy and that's serious.
I marvel that you are turning away so soon from Him who called you in the grace of Christ, to a different gospel, which is not another; but there are some who trouble you and want to pervert the gospel of Christ. But even if we, or an angel from heaven, preach any other gospel to you than what we have preached to you, let him be accursed. As we have said before, so now I say again, if anyone preaches any other gospel to you than what you have received, let him be accursed.
Galatians 1:6-9 NKJV
The Bible is absolutely clear, there is no ambiguity, we are saved by grace and not by works.
“Most assuredly, I say to you, he who hears My word and believes in Him who sent Me has everlasting life, and shall not come into judgment, but has passed from death into life. John 5:24 NKJV
And he brought them out and said, “Sirs, what must I do to be saved?” So they said, “Believe on the Lord Jesus Christ, and you will be saved, you and your household.”
Acts 16:30-31 NKJV
For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast.
Ephesians 2:8-9 NKJV
But when the kindness and the love of God our Savior toward man appeared, not by works of righteousness which we have done, but according to His mercy He saved us, through the washing of regeneration and renewing of the Holy Spirit, whom He poured out on us abundantly through Jesus Christ our Savior, that having been justified by His grace we should become heirs according to the hope of eternal life. Titus 3:4-7 NKJV
“Most assuredly, I say to you, he who hears My word and believes in Him who sent Me has everlasting life, and shall not come into judgment, but has passed from death into life. John 5:24 NKJV
When I took my driving test I knew that there were only two outcomes, pass or fail. You don't get a bronze, silver or gold driving licence, no, you just get a driving licence, that's if you've passed. It's the same when you become a Christian only the test is multiple choice, there's one question - do you believe in the Lord Jesus Christ and do you accept Him as your saviour? There's two answers, yes or no. There's two outcomes, saved or unsaved.
I know of no Bible verses that warn you that you can lose your salvation. Yes, you can surrender it and turn your back on it in the same way that Esau gave up his birthright for a bowl of stew Genesis 25:29-34 but there is no code of conduct that if you breach it will result in the loss of your salvation. Jesus died for all our sins, past and future.
So to OP I say, read this verse -
“You have heard that it was said to those of old, ‘You shall not commit adultery.’ But I say to you that whoever looks at a woman to lust for her has already committed adultery with her in his heart. Matthew 5:27-28 NKJV
So if the answer to your question is yes, then we need to close this forum down because we're all going to Hell! Anyone with a libido has committed that sin, I know I have.
But let me clarify, any believing Christian who sins deliberately, grieves and upsets the God he/she loves, and if you really love God you'll feel pretty awful afterwards and regret, repent, say sorry and ask forgiveness. God will always forgive. If you're in any doubt read Luke 15:11-32. But there's no question of being unadopted as a son of God.
Paul puts it like this-
What shall we say then? Shall we continue in sin that grace may abound? Certainly not! How shall we who died to sin live any longer in it? Or do you not know that as many of us as were baptized into Christ Jesus were baptized into His death? Therefore we were buried with Him through baptism into death, that just as Christ was raised from the dead by the glory of the Father, even so we also should walk in newness of life. Romans 6:1-4 NKJV
In summary the warning is this - if sin is a big part of your life, do not expect a Spirit fulfilled and joyful life, an incredible experience of God or much in the way of His blessings. You'll not experience the knowledge that God is in control and working for you if you're in constant rebellion with Him.
God bless.