Use published material to identify that your issue has already been addressed at length either by experts in the field, or in the broader society. Then demonstrate that your position, one about which your audience already knows quite a bit, is a brand-new take. For example:
Picture in your mind the four women who are closest to you. It may be your sister, your mother, your niece, your aunt, your best friend, your wife, or even yourself. According to at least six of my sources, including the research handbook, Rape and Sexual Assault III edited by Ann Burgess, one of the people pictured in your mind is or will become a sexual assault victim. The research handbook specifically states that one in four female college students will be sexually assaulted during her college career (Burgess, 1991).