In science fiction and technological speculation , gender can be challenged on the biological as well as the social level. Marge Piercy 's Woman on the Edge of Time portrays equality between the genders and complete equality in sexuality (regardless of the gender of the lovers). Birth-giving, often felt as the divider that cannot be avoided in discussions of women's rights and roles, has been shifted onto elaborate biological machinery that functions to offer an enriched embryonic experience, When a child is born, it spends most of its time in the children's ward with peers. Three "mothers" per child are the norm, and they are chosen in a gender neutral way (men as well as women may become "mothers") on the basis of their experience and ability. Technological advances also make possible the freeing of women from childbearing in Shulamith Firestone 's The Dialectic of Sex . The fictional aliens in Mary Gentle 's Golden Witchbreed start out as gender-neutral children and do not develop into men and women until puberty, and gender has no bearing on social roles. In contrast, Doris Lessing 's The Marriages Between Zones Three, Four and Five (1980) suggests that men's and women's values are inherent to the sexes and cannot be changed, making a compromise between them essential. In My Own Utopia (1961) by Elizabeth Mann Borghese , gender exists but is dependent upon age rather than sex — genderless children mature into women, some of whom eventually become men.  " William Moulton Marston 's Wonder Woman comics, pen name, William Moulton, of the 1940s featured Paradise Island, also known as Themyscira , a matriarchal all-female community of peace, loving submission, bondage, and giant space kangaroos."