The sides were characterized by anti-porn feminist and sex-positive feminist groups with disagreements regarding sexuality, including pornography, erotica, prostitution, lesbian sexual practices, the role of transgender women in the lesbian community, sadomasochism and other sexual issues. The feminist movement was deeply divided as a result of these debates. Many historians view the feminist sex wars as having been the end of the second-wave feminist era (which began 1963) as well as the herald of the third wave (which began in the early 1990s).