Is it possible to take sexual energy and direct it toward God? In other words, instead of using the sexual energy on masturbation, etc, is it possible to focus it on God?
Okay, a tricky one.
Sexual energy comes from a combination of hormones and brain activity that we can call lust. This lust is focused on a physical being and is tied into the sights, smells, actions and personality of that being. I don't think it can really be focused on God. It can be used for God-- in a marriage, of course. But the energy and the build up of pleasure hormones in the brain can be redirected-- with difficulty-- to act for God's kingdom, especially service.
There are three biochemical aspects to love: lust, "falling in love", and affection. While sexual energy can't be focused directly on God, the second two can. I have experienced this myself, but "falling in love" with God didn't last, just like it doesn't with a human being. But when it did, I was more focused on God and ready to worship Him than ever in my life. The important thing, however, is to not focus on the feeling but on God himself. Otherwise, when the feeling goes away, you feel emptied of God. But God is always there, always loving, always supporting, even if we don't feel Him.