The caption with the gal who's had 'a few drinks' is clever. Her getting impulsive and him having to respond is a great situation. Her desires might also be triggered by chatting with her girlfriends about guys, seeing some handsome stud on TV, reading a dirty romance novel, etc. etc. etc. ad infinitum.
That one actually came from a real life situation ... hmmm, must be a decade ago. Emergency cunnilingus call!