I'm reasonably sure that this is the paper in question if someone cares enough to actually want to read it: "Discriminating Males and Unpredictable Females: Ma

I'm reasonably sure that this is the paper in question if someone cares enough to actually want to read it: "Discriminating Males and Unpredictable Females: Males Bias Sperm Allocation in Favor of Virgin Females", doi:10.1111/j.1439-0310.2011.01928.x