Although the mechanism of infection of HPV in spermatozoa is not yet clarified, it is known that HPV is located at the equatorial region of the sperm head (the region that participates in the oocyte-spermatozoon fusion) through interactions between the HPV capsid protein L1 and syndecan-1, functioning in this way as a vector for HPV transfer into the oocytes [116,117]. Here, SDC1 is linked to infection.