Nothing much has changed over the years. In 2011 they are at it again: "Like Mário and André, you can find help in your efforts to conquer the habit of masturbation." Really, those dix are still up to writing about
"Although the people quoted in this article are males, many females also struggle with masturbation. Hence, the advice given pertains to both genders. Note, too, that this article discusses masturbating oneself. Doing it outside of marriage to another person is included in what the Bible calls fornication, a very serious sin in God’s eyes" (g 11/06 pp. 18-20).
Bible-based backup for that assertion: zip.