No sin can be allowed, none. We are not called to keep sinning less and less but to stop sinning completely. That many of us cannot do this has nothing to do with the radical call of Christ but with out own weakness of conscience, the false shaping of our minds, imaginations and memories, and the result of Original Sin, concupiscence.
God has called us to be saints, not to be lame sinners. His call has always been radical, showing us the perfection He draws us to. That the Protestants, for example, have accepted contraception, reveals the enemy of the soul, compromise. There is absolutely no compromise in the following of the Gospel.
The enemies of the Church, who think like Protestants, settling for a status quo and not for perfection, have pushed the media this week.