Many of the topics that feminist sexologists study include (but are not limited to) reproductive rights, sex work, gay and transgender identities, marriage, pornography and gender roles. Much of the work within feminist sexology has been done within the last few decades, focusing on the movements of sexual liberation in the 1960s and 1970s, the introduction of an easily handled and effective means of contraception, lesbian and transgender visibility, and the stronger waves of women taking charge of their lives. There has been much debate about whether the sexual revolution was really beneficial to women, if a pro-sex attitude can really be achieved within the context of Western society, but as new voices are lifted, layers of interpretation and knowledge can be gathered.