Yes, it is the nature of the beast to sin. But, God said be ye Holy for I am holy. The Bible preaches deliverence from sin! Paul wrote to the corinthians and asked them why they were still acting like "mere men" Why were they still living under the control of their natural desires? 1 Corinthians 3:3 in the amplified version of the Bible: For ye are still(unspiriual, having the nature) of the flesh-under the controll of ordinary impulses. For as long as there are envying and jealousy and wrangling and factions among you, are you not unspiritual and of the flesh, behaving yourselves after a human standard and like mere(unchanged) men?
Jesus saved us so we could be holy as he is holy. I don't want to throw stones, I only want to help you understand that the Bible does not promote any form of continuing in sin. Can we fail? yes. But 1 Corinthians 10:13 shows that we don't have to. God wants us to have victory over sin. However big or small. I would encourage you to study Galatians 5 and Romans 5-10 and see what you find out. All through there the Bible is teaching a crucifixion of our fleshly desires along with Christ and a resurection with Christ to a new life with new desires! Colossians 3:1-3 says in the amplified: If you then have been raised with Christ to a new life, thus sharisng His resurrection from the dead, aim at and seek the rich, eternal treasures that are above, where Christ is, seated at the right hand of God. And set your minds and keep them set on what is above- the higher things- not on the things that are on the earth. For as far as this world is concerned, you have died, and your new, real life, is hid with Christ in God.
A new creature or beast, through Christ Jesus. I'm thankful that by faith in the promises of God's word, we CAN live a sinless life through Christ. I didn't conquer my masturbation and lust and sexual desires problems, til I reckoned myself dead to them and I yielded one hundred percent of my life and desires and thoughts etc, to God. I don't mean to condemn or accuse you, but to encourage you to live holy in all manner of conversation(any aspect of life in the greek). 1 Peter 1:15-17.