Photos from inside the counter-summit show numerous empty chairs. Human rights activists who also attended the counter-summit said they saw fewer than 50 people at most of its sessions, and fewer than 10 at some.
One British speaker urged attendees to "get dressed and ready for battle,'' after sharing the addresses of local family planning service providers. He also suggested that African countries should restrict foreign-funded NGOs as Russia has.
A US official, Dianne Foley, compared teenage sex to the risks associated with tobacco and drug consumption, advocating an abstinence-first "just say no" approach to educating young people.
She took aim at comprehensive sexuality education programmes advocated by UN agencies, urging parents to more closely scrutinise what their children are being taught.
Other US officials who addressed the counter-summit claimed that UN institutions and abortion rights are ideological and unpopular, and gave a detailed presentation on how attendees could apply for US aid funding.
Brazilian and Polish politicians were also there. Their countries were among the few that signed a US-led statement against the summit, along with Belarus, Egypt, Haiti, Hungary, Libya, Senegal, St Lucia and Uganda.
Meanwhile, ICPD25 organisers said their large global summit had "mobilised more than 1,200 commitments from around the world", along with billions of dollars in financial pledges, to tackle issues including maternal deaths and unmet needs for family planning.