He defines asexuality as a complete lack of sexual attraction .

他将“无性恋”定义为完全感受不到性吸引力。

Asexuality is a fast growing sexual preference .

无性恋是一种正在快速增涨的性倾向。

They have found a species of crayfish that follows the logic of asexuality and does , indeed , clone itself .

他们发现了一种龙虾符合无性繁殖的理论，这些龙虾的确在克隆自身。

His book to be published next month , understanding asexuality , analyses asexuality further , arguing that greater numbers of people now consider themselves ' asexual ' .

他的书《了解无性恋》将于下个月出版，该书进一步对无性恋进行了分析，书中称现在更多的人认为自己是“无性恋者”。

" There are almost certainly systems where strict asexuality arises , and the lineages go extinct over evolutionary time thousands or tens of thousands of years , " says david hillis of the university of texas at austin .

德克萨斯大学的大卫西里斯说：“几乎可以肯定地说，严格的无性繁殖方式必然导致物种被进化过程淘汰几千或几万年后灭绝。”