Two breasts good, two balls bad?

Not sure how I feel about positive discrimination. David Cameron is intent on having more women as prospective Conservative MPs, and to this end has decreed that all future candidates are to be chosen from a centrally produced list, 50% of which will consist of women. If this means that women will be included who deserve on merit to be chosen, but who might otherwise be discriminated against by mysogynistic male-dominated selection panels, fine and good. But if what this means is that able men will be pushed off by less able women, simply to keep the percentage of the sexes equal, then this can't be right, or good for the party.