"Glory Season" (1993) by David Brin is set on the planet Stratos, inhabited by a strain of human beings designed to conceive clones in winter, and normal children in summer. All clones are female, because males cannot reproduce themselves individually. Further, males and females have opposed seasons of sexual receptivity; women are sexually receptive in winter, and men in summer. (This unusual heterogamous reproductive cycle is known to be evolutionarily advantageous for some species of aphids.) The novel treats themes of separatist feminism and biological determinism. Elizabeth Bear's novel "Carnival" (2006) revisits the trope of the single-gender world, as a pair of gay male ambassador-spies attempt to infiltrate and subvert the predominately lesbian civilization of New Amazonia, whose matriarchal rulers have all but enslaved their men. The fantasy world of Scott Lynch's 2007 "Red Seas Under Red Skies" offers a new variation on the long-established genre of pirate literature - depicting a pirate ship which is run on the basis of complete gender equality. The pirate crew is composed of a roughly equal number of men and women, and crew members may freely engage in sex - homosexual or heterosexual, as they choose - when off duty. Since shipboard life offers little chance of privacy, the sound of people having a noisy orgasm is a normal part of night time routine on board the "Poison Orchid". However, any attempt at a sexual act without the other person's sexual consent is punished immediately and severely. The formidable Captain Zamira Drakasha is raising her two children aboard, and is well able to combine being a deadly fighter and strict disciplinarian with her role as a loving and doting mother - but having children aboard is a privilege reserved to the Captain alone; other female pirates who get pregnant must leave their children on shore. The plot of "The Tamír Triad" by Lynn Flewelling has a major Transsexual element. To begin with the protagonist, Prince Tobin, is to all appearances a male - both in his own perception and in that of others. Boys who swim naked together with Tobin have no reason to doubt his male anatomy. Yet, due to the magical reasons which are an important part of the plot, in the underlying, essential identity Tobin had always been a disguised girl. In the series' cataclysmic scene of magical change this becomes an evident physical fact, and Prince Tobin becomes Queen Tamír, shedding the male body and gaining a fully functioning female one.