These double-ended dildos are one of the most popular sex toys both for males and females, even though their primary intent was to satisfy lesbian couples. They may be used butt to butt, butt to vagina, or vagina to vagina. Built to allow every female partner to place one end while stopping in the middle to rub against one another. Gay and heterosexual couples also learned that double-ended dildos are indeed diverse sex toys, and are used in dual anal arousal.