Because every villain has a weak point... and Wulf'sahr's is styling girls' hair (funny fact, all these hairstyles exist in real life... or at least in movies, cartoons and the Internet). XDD
It's a family thing, it seems! http://www.furaffinity.net/view/24138066/

Yup, Karnak's parents didn't get along well... a biiiig euphemism for 'that asshole got insulted to not being considered hot by her and killed her whole clan, burned her village and kidnapped her to become his slave'. Hurrah for being chill! *facepalm*
But there were some almost normal moments, especially when she became pregnant.
For more about their background look here
After Vil'ka became pregnant (warning for noncon)
https://illydragonfly.livejournal.com/35888.html
https://illydragonfly.livejournal.com/36223.html

Before Vil'ka became pregnant (warning for sex)
https://illydragonfly.livejournal.com/44472.html
https://illydragonfly.livejournal.com/55688.html

For more about yautjas look in my AvP folder. As usual I don't own yautjas, just my OCs.