Fisher, Helen E. <br/><br/>
The sex contract :  the evolution of human behaviour / 
Helen E. Fisher. 
 - London :  Granada,  1982. 
 - 176pages:  ill map;  23 cm. 
<br/><br/>Bibliography: p165-172 
<br/><br/><label>ISBN: </label>0246117680 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sex customs.<br/>Human evolution.<br/>Behavior evolution.