It's accepted that it's everyone's responsibility to copulate responsibly.
Polly is at a party where she has been flirting with a guy named Chip all night.
Polly wants to sleep with Chip.
Polly makes sure to use a condom with Chip.
Polly tells Chip not to use a condom.
Polly is able to have safe sex without getting pregnant.
Polly gets pregnant from her one-night stand.