In last week's case, the man died unexpectedly. He had been planning to have more children with his partner. However, he had not signed a written consent permitting his partner to use his sperm after death - a requirement under the federal Assisted Human Reproduction Act. The court said that the requirements of the AHRA were clear that a written consent was required, and denied permission to use the sperm of the deceased man to create more children.
Think about death.
You should have a will anyway; and as part of planning for what happens if you die, you can include a consent to permit your partner to extract and use your sperm if you die.