[Solved] A mother's immune system may have a defensive response to substances produced by male fetuses.This is most likely to contribute to A) erotic plasticity. B) female orgasmic disorder. C) sexually transmitted infections. D) the fraternal birth-order effect. Fetal Alcohol Effect: A condition resulting from alcohol exposure during the mother's pregnancy, causing brain damage and growth problems in the child. Diethylstilbestrol: A synthetic estrogen that was formerly prescribed to prevent miscarriages and other pregnancy complications before its connection to serious health risks in offspring was discovered. Teratogens: Substances or elements that lead to fetal or embryonic developmental issues or congenital anomalies. Blastocyst: A blastocyst is an early stage in the development of an embryo, consisting of a sphere of cells surrounding a fluid-filled cavity and the cluster of cells from which the embryo will develop.