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That is a really interesting question. Sociopaths are characterized as having no conscience and no empathy for others. They can be fueled by sex and power, but not necessarily.
They are usually involved in criminal behavior, and I suppose a case could be made that they are fueled by power, since it is all about them staying in control, but the basis of their personality is that they really don't care about anyone else. For them the ends always justify the means, legal or not.
I don't think sociopaths are more likely to be bi-sexual than anyone else.
Did you have more questions about this?