human primates to gain an understanding of human sexual strategies.  
Many aspects of human sexuality both place humans within the context of 
the non-human primate sexual strategies, as outlined above.  Other traits 
of humans contrast with non-human primate sexual strategies and are 
pretty much unique to Homo sapiens.  One of the most important 
distinctions, as far as sexual strategies are concerned, is "the evolutionary 
trend of increasing sexuality from apes to humans."
	There are many biological indicators of the increasing importance 
of sexuality in humans, when compared to other primates.  Some of these 
indicators are easily measured characteristics, such as the size of testes and 
penis, in relation to other primates.  It is well known that human males 
have larger testes than all other primates do, although in comparison to 
chimpanzees, human testes account for a smaller percentage of total body 
weight.  The human penis is also longer and thicker, in relation to overall 
body size, than that of any other primate.  Other factors, while easily 
observed are not as quantitative.  The loss of visible signs of estrus in 
human females, as a result of bipedalism, serves to increase the sexuality 
of humans, by requiring that human females be receptive to mating at all 
times and requiring human males to mate continually, since they do not 
know precisely when their mating is effective.  Humans have also evolved 
an incredible tactile sensitivity, especially in the hands and the face, where 
the majority of our sensory nerves are located.  This increase in the 
sensitivity heightens the pleasure associated with sexual activity, thereby 
intensifying sexuality in humans.
	Human sexuality has not only been affected by biological 
evolution; the natural state of human behavior has also evolved, in this 
case to encourage sexuality.  It has been asserted that "just as evolution 
favored human beings who were able to stand upright, it favored human 
beings who felt love."  In this sense, love is a chemical attraction to other 
members of the same species.  Humans are among the most promiscuous 
of all animals, as are our close relatives, the bonobo.  Bonobos are known 
to copulate "at every turn" and for various reasons: to relieve stress, to 
create group solidarity, to release excitement, for pleasure and, of course, 
to reproduce.  The fact that humans copulate for reasons other than 

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