Scenario: Post-climax, you pull out to find that the condom broke. Semen dribbles from the tip. Sex nightmare, realized.
Solution: Calmly explain the situation to her, and discuss your options. Are STDs a possible issue? Have you both been tested? Pregnancy is the other serious concern. The morning after pill is effective up to 72 hours after pregnancy. Plan B is effective, but costly: the pill costs almost $50. The responsibility is shared, and the cost should be split accordingly. Offer to go with her, but if you sense you're no longer wanted, bow out like a gentleman.