Yes. It's called Self-Identification which means any man can simply declare himself a woman and depend to enter woman's change rooms. If any woman disagrees she is a hateful bigot. Sounds fair doesn't it?What hassle(s) did Lia Thomas go through to become a woman?
Did he/she walk into a women dressing room simply announced "I am woman, let me through".

Example in Canada.

Improving gender designation process for people in B.C.
Two-spirit, transgender and gender-diverse people in British Columbia are able to change gender designations on the BC Services Card, B.C. driver’s licence, BCID card and B.C. birth certificate without the confirmation of a physician or psychologist.
news.gov.bc.ca