Sexual violence is a profound social and public health problem in the United States. As will be covered in more detail to follow, sexual violence includes completed or attempted penetration of the genital opening or anus by the penis, a hand, a finger, or any other object, or penetration of the mouth by the penis or other object. Sexual violence also includes non-penetrative abusive sexual contact (e.g., intentional touching of the groin), as well as non-contact sexual abuse (e.g., voyeurism, exposure to pornography). Sexual violence occurs when the victim does not consent to the sexual activity, or when the victim is unable to consent (e.g., due to age, illness) or refuse (e.g., due to physical violence or threats). According to the National Violence Against Women Survey (NVAWS), 1 in 6 women and 1 in 33 men have experienced an attempted or completed rape, defined as forced vaginal, oral, or anal penetration, in their lifetime (Tjaden and Thoennes 2000). These numbers exclude abusive sexual contact and non-contact sexual violence. Furthermore, they do not take into account the potential for significant underreporting of this crime due to its sensitive nature. Therefore, many researchers and practitioners in this field believe that existing national statistics underestimate the number of victims of sexual violence.