Children of the Divine Order
Sex magic is all about emotion: Love, lust, passion, pleasure, and ecstasy. It is often considered less useful then other aspects, but the smart and creative person can do powerful things with it.
Sex magic can be used to overcome certain obstacles by allowing you to seduce people, or entice them into taking action.
Create an Advantage
Sex magic is perfect for creating advantages. Making people fall in love, become locked in ecstasy, etc.
Sex magic is not useful for performing attacks.
Sex magic is not useful for defending.