And some of the problems may arise from the fact that there is no clear concept of the phenomena we are trying to explain. Being gay or straight does not seem to be a rigid, unchangeable state of being. Collected papers from a conference in Berlin in July 1990. Some are better than others, as would be expected from such a conference. But this collection can be read selectively, depending on the reader's particular interests.
Bisexualities contains no break-thrus of thought or science.
All of the contributors have well-established credentials as sexologists. He allows, however, that such genetically-given orientations are subject to social modification. When more celebrities 'come out' as bisexual, it becomes chic. Some women become involved with other women sexually because it is 'politically correct' in some feminist sub-cultures. If men are the oppressors, women should not cooperate with them in any way especially not 'sleeping with the enemy'.