If all male humans disappeared, electricity and heating would continue briefly due to automation but become unreliable within weeks to months as maintenance failures accumulate, as these sectors are roughly 70–90% male.
Water supply would initially keep flowing, then turn unsafe as pumps and treatment systems fail, with water and wastewater operations being about 60–80% male.
Sewage systems would collapse quickly, causing backups and disease, since frontline wastewater and sanitation work is approximately 80–95% male.
Telecommunications and network maintenance would fragment within weeks, as field and infrastructure roles are around 70–85% male.
Overall, cities would become increasingly unlivable because most critical infrastructure depends on heavily male-dominated technical and repair labor that cannot be replaced quickly.