system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why arn't men freezing their sperm and getting vasectomies in order to avoid unwanted pregnancies?

Just seemed like a practical idea.
gpt
The cost for starters.  You'd be paying for the vasectomy (and any time off to get the operation done), paying to have your sperm frozen, paying to keep it frozen and stored for however long (it apparently stays good for about twelve years), and then paying for the artificial insemination.