Its from the IOC charter.
The practice of sport is a human right. Every individual must have the possibility of practising sport, without discrimination of any kind and in the Olympic spirit, which requires mutual understanding with a spirit of friendship, solidarity and fair play.
I would point out the 'without discrimination' and 'fair play'. So female participants should not be discriminated against just because they have physical disadvantages which are unavoidably relevant in sport.
'... the following Bill of Rights for Young Athletes was suggested by the Institute for the Study of Youth Sports at Michigan State University. They say a young person has these rights:
Right to participate in sports
Right to participate at a level commensurate with each child's maturity and ability
Right to have qualified adult leadership
Right to play as a child and not as an adult
Right of children to share in the leadership and decision-making of their sport participation
Right to participate in safe and healthy environments
Right to proper preparation for participation in sports
Right to an equal opportunity to strive for success
Right to be treated with dignity
Right to have fun in sports
I would point out 'safe and healthy' and 'equal opportunity to strive for success'.
Girls' sport matters. Women's sport matters.