Strange how ideas have a habit of coming round again. Scientists have recently suggested that the female reproductive tract in we humans acts like an obstacle course designed to 'weed out' sperm that are not in top physical condition (https://www.theguardian.com/science/2019/feb/13/female-human-body-blocks-weak-sperm-scientists-find). This would help ensure that the products of fertilisation are likely to be viable. I remember Dr Jack Cohen (then of Birmingham University) suggesting this idea around 40 years ago!
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