The same competitive dynamic also exists amongst women but unethical behaviour is not as strong as in the case of men. Women also preferred more subtle forms of deception.
How companies can protect themselves
Having a woman negotiating may be advantageous especially if the counterpart is a male. Generally speaking, women should be a part of negotiating teams and anything that is likelyto exacerbate competitiveness (e.g. a macho corporate culture) should be reconsidered. It might also help if negotiations are scheduled for later in the day when testosterone levels are usually lower.