The reality is that both cisgender and transgender athletes have biological differences (and even potential advantages).

But these advantages are only strictly regulated in trans athletes, and sometimes even used as an argument to exclude them from sports.

There are no differences in circulating testosterone between those assigned male at birth and those assigned female before Tanner stage II of puberty. The only significant difference is the presence/absence of a penis which has no impact on or relevance to one’s athletic abilities.

Genital exams, genotyping, and hormone evaluations are used as methods of verifying if someone is transgender or not to exclude them from participating in sports.

These methods are enforced by:

1. Checking every single athlete who participates (logistically & financially impossible, problem of consent)
2. Accusation based testing (anyone accused of being transgender is subject to testing). Not only is this incredibly invasive, but such practices are degrading to women.

Many people don’t care about sports or fairness until a transgender person wants to participate. If people truly want to bring fairness to the forefront, then they’d talk about barriers to the access to sports: socioeconomic disparity, often intertwined with systemic oppression such as racism. If they truly cared about equity and justice in sports, they’d focus on uplifting marginalized groups, not on attacking them.