Willpower determine if you have the self-confidence and strength to stand up for yourself and make a choice rather then be forced around so it's a stat that important to keep up same for smarts to talk smooth and fitness to fight back (though I feel like it was missing for me at some point since I keep really fit)
Wildcard also seem to play in alot of you picked that one since it is about your character getting spontane ideas or if you have a slutty personality it would be put of character for you to turn down certain advances