This section is from the book "Human Sexuality", by J. Richardson Parke. Also available from Amazon: Human Sexuality.
In cases of sexual hyperesthesia, with paresthesia of the moral sense, the tendency to crime, or to abnormal acts, is frequently conditioned by libido nemia, in especially passionate persons; the point of contradistinction to be carefully observed in all cases of pederasty, from a legal standpoint, being between acts committed by perverts of birth, and those of old and decrepit debauchees, who sometimes use boys for the heightened stimulus involved. The pronounced uraing, to whom normal heterosexual intercourse is congenially disgusting, him whom I have ventured to christen the "normal invert," will always be readily recognized. In such there are usually found traces of both psychopathia sexualis and paranoiac taint; and, as I have intimated, the distinction is not usually difficult to make between this class of persons and those who manifest episodic, or casual, tendencies to contrary sexual acts.
Outside the condition of senile dementia, however, which should never be lost sight of as a possible factor in moderately advanced life, for many men are old in feeling who are still young in years, the crimes of pederasty, orastupration, sapphism, cunnilingus, masturbation and bestiality, when not associated with those outré, fantastic, and silly concomitants already alluded to, may very properly be considered as vices, pure and simple, and be thus dealt with by the law.
 
Continue to:
sexuality, reporduction, genitals, love, female, humans, passion