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Table of contents
PREFACE
TOUCH-1
TOUCH-2
TOUCH-3 (begin)
TOUCH-3 (end)
TOUCH-4 (begin)
TOUCH-4 (end)
SMELL-1
SMELL-2
SMELL-3.1
SMELL-3.2
SMELL-3.3
SMELL-3.4
SMELL-3.5
SMELL-4 (begin)
SMELL-4 (end)
SMELL-5
HEARING-1
HEARING-2
HEARING-3
VISION-1.1
VISION-1.2
VISION-1.3
VISION-2.1
VISION-2.2
VISION-2.3
VISION-2.4
VISION-3
VISION-4
VISION-5
APPENDIX A
APPENDIX B HISTORY-1
APPENDIX B HISTORY-2.1
APPENDIX B HISTORY-2.2
APPENDIX B HISTORY-2.3
APPENDIX B HISTORY-3.1
APPENDIX B HISTORY-3.2
INDEX OF AUTHORS

sensory stimuli proceeding from a person of the opposite sex gradually 

produce the physiological state of tumescence, with its psychic 

concomitant of love and desire, more or less necessary for mating to be 

effected. But between those who have been brought up together from 

childhood all the sensory stimuli of vision, hearing, and touch have been 

dulled by use, trained to the calm level of affection, and deprived of 

their potency to arouse the erethistic excitement which produces sexual 

tumescence.[187] Brothers and sisters in relation to each other have at 

puberty already reached that state to which old married couples by the 

exhaustion of youthful passion and the slow usage of daily life gradually 

approximate. Passion between brother and sister is, indeed, by no means so 

rare as is sometimes supposed, and it may be very strong, but it is 

usually aroused by the aid of those conditions which are normally required 

for the appearance of passion, more especially by the unfamiliarity caused 

by a long separation. In reality, therefore, the usual absence of sexual 

attraction between brothers and sisters requires no special explanation; 

it is merely due to the normal absence under these circumstances of the 

conditions that tend to produce sexual tumescence and the play of those 

sensory allurements which lead to sexual selection.[188] It is a purely 

negative phenomenon and it is quite unnecessary, even if it were 

legitimate, to invoke any instinct for its explanation. It is probable 

that the same tendency also operates among animals to some extent, tending 

to produce a stronger sexual attraction toward those of their species to 

whom they have not become habituated.[189] In animals, and in man also 

when living under primitive conditions, sexual attraction is not a 

constant phenomenon[190]; it is an occasional manifestation only called 

out by the powerful stimulation. It is not its absence which we need to 

explain; it is its presence which needs explanation, and such an 

explanation we find in the analysis of the phenomena of courtship. 

 

The abhorrence of incest is an interesting and significant phenomenon from 

our present point of view, because it instructively points out to us the 

limits to that charm of parity which apparently makes itself felt to some 

considerable extent in the constitution of the sexual ideal and still more 

in the actual homogamy which seems to predominate over heterogamy. This 

homogamy is, it will be observed, a _racial_ homogamy; it relates to 

anthropological characters which mark stocks. Even in this racial field, 

it is unnecessary to remark, the homogamy attained is not, and could not 

be, absolute; nor would it appear that such absolute racial homogamy is 

even desired. A tall man who seeks a tall woman can seldom wish her to be 

as tall as himself; a dark man who seeks a dark woman, certainly will not 

be displeased at the inevitably greater or less degree of pigment which he 


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