Whether California's male-only statutory-rape law violated the Equal Protection Clause because it criminalized intercourse by males with underage females but did not criminalize the female participant's conduct.
Holding
No. The sex-based classification was sufficiently related to California's important objective of preventing illegitimate teenage pregnancy and therefore survived equal-protection review.
Reasoning
The Court declined to apply strict scrutiny to sex classifications. Its precedents instead required a more demanding form of review than ordinary rational-basis review: the classification must bear a fair and substantial relationship to legitimate state ends, or, in the Court's later formulation, a substantial relationship to important governmental objectives. Sex classifications cannot rest on administrative convenience or archaic stereotypes, but they may reflect genuine physiological differences when men and women are not similarly situated.
California could reasonably treat prevention of illegitimate teenage pregnancy as at least one purpose of § 261.5. The Court gave substantial deference to the California Supreme Court's identification of that purpose and recognized the serious medical, social, educational, and economic consequences of teenage pregnancy for young mothers, children, and the State.
The Court emphasized the basic biological difference relevant to the statute: only females can become pregnant, and young females bear the physical, emotional, psychological, and social consequences of pregnancy far more directly than males. California could therefore seek to protect minor females by deterring the male conduct necessary for conception.
The male-only criminal sanction could also roughly equalize deterrents. A minor female already faces the natural and substantial deterrent of pregnancy and its consequences; her male partner does not. California could reasonably add a criminal deterrent only to the male participant, who faces comparatively few unavoidable consequences from the sexual act.
The Court rejected the argument that the law depended on a stereotype that males are generally aggressors. The statute was upheld not because males were presumed more blameworthy in every encounter, but because the Legislature could impose an additional deterrent on males to address teenage pregnancy. That rationale applied even when, as here, the male was also under 18, because a minor male is as capable as an adult male of causing pregnancy.