First off I never said to think of sex is a sin.
The Bible tells those things what to do and bot to do.. If you have a problem with scripture thats on you.
If you have a problem with what a repented sinner did in his past; take that up with Jesus.
Its not an excuse to endorse a sinful lifestyle.
Encourage people in fornication to get married, instead of hammering them with it's a sin. That is what Paul did. Stop telling them it's a sin to even think of sex or that masterbation is a sin. I actually had a pastor's wife tell me I shouldn't be looking for a wife, because I was married to Jesus. How dumb is that?