 If God gave us sexual desires, how could they be wrong? If the Creator didn't want you to masturbate, they would have put your genitals in the middle of your back where you can't itch. Instead, it's the most convenient place possible. Like all the places you're not supposed to touch, like they're just really easy to get to. Simply having the desire to do something sexual or otherwise doesn't make it right. There are plenty of sexual behaviors that even non-Christians would say are definitely wrong. So we all draw the line somewhere depending on where you get your morality from. I go to the Word of God and it says that we've taken God's good design for sexuality and we've distorted it because of our sin. You see, sexual fulfillment is perfectly acceptable within the context of marriage. In this context, we're called to think of the needs of our spouse first, which is in direct contrast to selfish sexual fulfillment in masturbation. Though we all have a tendency towards sinful desires, God has said that when we put our faith in Him, He will make us into a new creation. That doesn't mean that all of our temptations will disappear overnight, but it does mean that through God's power and presence in our life, He has given us everything we need to overcome that temptation.