“Fertilization is a matter of life or death. In animals of sexual reproduction, the appropriate communication between mature and competent male and female gametes determines the generation of a new individual.” 106
106 Darszon A, Labarca P, Nishigaki T, Espinosa F. Ion channels in sperm physiology. Physiol Rev. 1999 Apr;79(2):481-510, https://pubmed.ncbi.nlm.nih.gov/10221988.