There are some metrics that are related to fertility like ejaculation volume and sperm motility[0]. 0: https://en.wikipedia.org/wiki/Sperm_motility https://en.

There are some metrics that are related to fertility like ejaculation volume and sperm motility[0]. 0: https://en.wikipedia.org/wiki/Sperm_motility https://en.wikipedia.org/wiki/Sperm_motility