An extract from that article :
UNESCO recognises the provision of single-sex toilets as being vital to overcome the barriers preventing girls from accessing education. In UK and North American schools, however, single-sex provision is being eroded in favour of ‘gender-neutral’ – actually unisex – facilities. This has led to protests, but most schools who have introduced these toilets are refusing to reconsider their decisions. Both sexes are showing discomfort at having to share facilities, but for girls there is the added complication of learning to deal with menstruation in a unisex environment. We already know that girls miss school during their period, so to add the presence of boys in the toilets to these existing problems seems just a further way to compromise girls’ education.