A friend of mine has an adult daughter who is mentally disabled. Roughly speaking, her daughter thinks and talks like a seven-year old child, and cannot take care of herself. The disabled daughter is sexually interested in men, but as far as I know she never had sex with anyone. When she was 20-something, the mother had the daughter medically sterilized. This brought her no suffering, and she behaves as she did before. The mother's fear was that she would get pregnant. For a few weeks every year, the daughter is away from her mother in a clinic for mentally disabled people. I wonder if it was morally acceptable for the mother to have her daughter sterilized.