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Benefits accruing to females who exercise mate choice have been defined to be either 'direct' or 'indirect'. We suggest an alternative distinction: benefits can be considered 'fixed', meaning they are on average equal to all females mating with the same male (e.g. good genes' benefits) or 'dilutable', meaning they are shared between females mating with the same male, so that the more mates a male has, the lower the average benefit to each (e.g. fertility benefits or many forms of direct benefit). Using a simple model, we show that this distinction has a major effect on the form of female preference. We predict that mating skew will be far greater in species where the benefits are fixed when compared with those where the benefits are dilutable.

Fixed and dilutable benefits: female choice for good genes or fertility