When tolerance crosses the line of exploiting the weak and innocent it has gone too far. When addressing the church of Thyatira Yeshua rebuked them for tolerating "that woman Jezebel".
The deceptive nature of sexual immorality is that it leads people into darker and darker sins which leads to the harm of the most vulnerable of society. If we are going to stand in our generation, unstained by the darkness all around, we must be willing to separate ourselves from all that is unclean.