Finishing Without Warning
Scenario: You're approaching the point of no return and get so caught up in the throes of pleasure that you forget to give her a heads-up.
Solution: Even a woman who's pro-semen wants some warning before you spurt off somewhere that isn't in a condom. If you mistakenly misfire and leave her a mess, all you can do is apologize, and reassure her it was an accident with every iota of sincerity you can muter. You know, after you help clean up.