The attached ref are the published regulations of eligibility for female athletes in specified track events based upon their naturally occurring testosterone levels. Following the very public debates with Castor Semenya , her banning, medications and finally her return to medal winning form, has spawned plenty of articles about the rights and wrongs of how this should play out. My readings across this is that the fundamental segregation between men and women confers advantages on women based upon gender and these arise from this.
https://www.iaaf.org/news/press-release/eligibility-regulations-for-female-classifica