Which method does spermicidal foam specifically target to prevent pregnancy?

Spermicidal foam specifically targets the mechanism of killing sperm to prevent pregnancy. When the foam is applied inside the vagina, it releases chemicals that immobilize and destroy sperm cells. This action reduces the likelihood of sperm reaching the egg for fertilization, making the foam an effective barrier method.

While preventing ovulation is a role played by some hormonal contraceptives, spermicidal foam does not influence ovulation. Blocking sperm entry can be a part of the foam's function, but the primary mechanism at play is the direct destruction of the sperm. Regulating hormones is also not applicable since spermicidal foam does not have any hormonal effects; it solely works to incapacitate sperm on contact.