Female animals are those that produce ova, which are fertilized by the spermatozoa of males. The main difference between females and males is that females bear the offspring — and that goes for dogs, chickens, catfish, and anything in between.
参考资料： 维基百科英文词条：Orgasm 维基百科英文词条：Human sexual response cycle 外文文章：Female orgasm captured in series of brain scans Vance E B, Wagner N N. Written descriptions of orgasm: a study of sex differences. [J]. Archives of Sexual Behavior, 1976, 5 (1):87-98.
