Modifies paragraph (15), paragraph (18), and paragraph (19) formatting and adds a new paragraph (20) that permits an organization to have as an eligibility criterion a requirement that an amateur athlete may only participate in events and competitions corresponding to the sex of the athlete for the Olympic Games, the Paralympic Games, the Pan‑American Games, the Parapan American Games, or any other national, regional, State, or local event or competition sanctioned by such organization.

Adds new definitions to 36 U.S.C. 220501(b) for the terms 'sex', 'male', and 'female'.

Adds subsection (c) 'Continued sanctioning of certain competitions' requiring national governing bodies to continue sanctioning certain single-sex amateur athletic competitions that meet the section's requirements and were sanctioned during the 10-year period prior to enactment; prohibits rescinding or altering sex-related competition categories (except to comply with 220522(20)) for such events sanctioned prior to enactment that have not yet occurred; includes a rule of construction permitting sanctioning of mixed-sex competitions.