I honestly think the problem we have with so called lust connected to body parts is a problem the church created. By making the natural body sin and all the legalism and tradition behind it, it actually created the problem. It took away natural sexuality and replaced it with myths and taboo. It created a mindset that resulted in sexuality becoming preverted.
Again, in areas not effected by legalism and religious tradition, body parts don't make people fall into a sexual stupor. My one visit to Africa, actually with a church mission group, we came upon nothing but naked people. The only people affected by it were those in our group. They don't look at each other in steaming lust, even while naked. They actually have a healthy respect and strong family values with all running around naked. Having no hang up with the body, they used deeper reasoning when seeking a marriage partner.
Throughout history, these many tribes never had problems with lust, jealousy, sexual rage or rape crimes, until they converted. They were then taught the body is dirty, sexually bad and had to be covered. Family stuctures that lasted for generations came apart, crime went up over hate and jealously, ect.
Many Christian, unbiblical principles, actually caused the problems with sexuality. We feel guilty over our body parts because of tradition and misguided teachings. That guilt is actually what has resulted in the host of sexual problems and crimes we have today.
The debate that its' what "God says" over culture is silly. It shows lack of biblical knowledge, putting early church teaching that were used to control people over actual truth.