A friend asked once why I was against premarital sex. I told her that as a man I had no problems with it, or any of the plethora of pleasure seeking activities so in vogue nowadays. There is no reason why people should not be allowed to imbibe their hearts desire, whatever it may be.
However, I continued, as a Christian I cannot agree with it because disagreement with the Word of God is akin to being disobedient to Him. I cannot indulge in the desires of my heart because my heart is wicked, and I defer to the better judgement of the Almighty when He said to drop everything I wanted, take up the burden of the cross and follow Him.