...Their sexual and parental relationsevidenced an amount of tact and delicacy of feelings unsurpassedamong ourselves, either in the simplicity of the country or therefinements of the town... 
W.E.B. Du Bois 「The Negro」
...None of these are, in general, sexual distinctions, and, moreover, are at complete variance with the female here figured...
William Swainson 「Zoological Illustrations, Volume II」
...Barbour (1956:35) did sort 167 snakes into size classes, but did not determine sex ratio, size at sexual maturity, reproductive cycles, or snout-vent length...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Neitherthe sexual development nor propensities are wanting, but theyare seldom indulged with effect...
Richard L. Allen 「Domestic Animals」
...Beginning with the eggs and chickens, I will pass on to the secondary sexual characters, and then to the differences in external structure and in the skeleton...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...716) remarks that he knows no species which presents any remarkable sexual distinction; but it is stated ('Naturalist's Library, Birds,' vol...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Monoecious: when both sexual elements or glands existin one individual...
John. B. Smith 「Explanation of Terms Used in Entomology」
...Secondary sexual characters: features possessed by onesex but not the other, other than the differences of thereproductive organs themselves; e...
John. B. Smith 「Explanation of Terms Used in Entomology」
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menstrual volatile concept
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