Working Group on Biological Sex, Sports Eligibility, and SRY Screening

So, when we looked, we asked the working group to review the state of the science, including

the development since 2021, and they reached consensus that male sex confers performance

advantage in all sports and events that rely on strength, power, and or endurance.

And that to protect fairness in such sports and events, as well as safety, particularly

in contact sports, so combat, collision, and projectile sports, that it would be necessary

and adequate to base eligibility for competition on biological sex.

And that the most accurate and least intrusive way currently available to screen for biological

sex is by screening for the SRY gene.

Furthermore, they let us know that sex and gender, they defined, as was defined before,

they informed us that sex and gender is distinct from gender identity, sex and gender are distinct

from one another, and that testosterone levels in healthy adult males are 15 to 20 times

more higher in circulating testosterone than healthy adult females.

The testosterone levels do not overlap between the groups.

And the gap in testosterone levels exists in both general and elite athlete populations,

so that males experience three significant testosterone peaks in utero, in mini-puberty

of infancy, and beginning in adolescent puberty throughout adulthood.

And so, consistent with those higher circulating testosterone levels, males have larger and

stronger skeletal muscle and bone, larger and stronger hearts, larger lung size, more

red blood cells, and lower body fat than females trained to an equivalent level.

Together, these attributes afford males individual sex-based performance advantages in sports

and events that rely on strength, power, and endurance.

Furthermore, female athletes can experience performance disadvantages relative to male

associated with female anatomy and physiology.

And these disadvantages may include menstrual cycle, gestation, or anatomical differences,

such as periodic ligament laxity or looseness, wider hips, or more breast tissue.

And finally, that X, Y transgender athletes and athletes with certain X, Y differences

and disorders in sex development have anatomical and physiological advantages in line with

being male, even as their legal sex and the manner in which they were raised and or their

gender identity may vary.

So X, Y transgender athletes and athletes with X, Y DSD typically have testes, testicles,

and testosterone levels in the male range.