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Click here for our new Web Site Commonest instances of sex change Birds start off with two embryological ovaries but in general only one - the left develops to maturity and the right one remains rudimentary. If however the left ovary is destroyed by disease or deliberate experimental technique then the right ovary will develop, not into a mature Ovary, but into a functional testis! In this way a complete sex reversal can occur in some species of domestic fowl. An erstwhile female may acquire cock plumage and tread and fertilise hens. There are instances on record where an individual started off by laying eggs and finished up fertilising females. Sex reversal very rarely occurs in the opposite direction. From The Illustrated Book of Sexual Records. © 1974, 1982, 1997-2001 G.L. Simons Back to Home Page Other Categories   Human Physiology     Sexual Techniques and Peformance   The Arts Abberant Sex and Deviations Animals and plants Contraception and Castration Sexology Prudery, Superstition and the Law Looking for a "hot" date? Something naughtier? ABC Fantasy Dating Hot videos, DVDs? All tastes, and streaming video! Try Adult Videos & DVDs World Sex News On nudity, pornography Erotica, Orgasms, Lesbians Click here See Also World Sex News Erotic Awards Sex Maniacs Ball Sexual Freedom Coalition Encyclopedia of Unusual Sex Practices Catastrophism!

Search: Animals and plants First plants to reproduce bisexually Most primitive plant conjugation Earliest medium of sex cell transmission Most primitive hermaphrodite Siamese twins Commonest instances of sex change [i] Most primitive sex change Best known example of sex change [i] Only instances of sex role reversal Most numerous sex organs in a species [i] Largest penis in animal kingdom Oddest penis Fastest erection Most copious ejaculators Largest mammalian litter Most convincing female orgasm Largest participants in group sex Most primitive kissers Longest kissers [i] First virgin birth amongst domestic fowl [i] Least expected masturbatory activity First animal love songs Longest love songs [i] Most complex insect love songs Most vaginas in one animal Most unusual mammalian vagina Longest clitoris Largest mammary glands Most coital thrusts by howler monkeys Least coital thrusts by howler monkeys Longest sperm Longest vagina [i] Most nipples [i] Largest animal testes Longest mammalian intercourse Longest coital session [i] Shortest coital session Shortest coital session amongst insects Most sexually active sheep [i] Nymphomania first induced in cattle [i] Most sexually adventurous [i] Most vicious form of intercourse [i] Most remarkable coital mechanics