I guess the problem is that girls can't digest other girls getting more preference. It is human, but girls have more tendency to do so. So,if they see lack of attention at office, they slwly concentrate to regain it thus losing the interest/getting tired for home obligations. And in majority of office situations, ego takes the lead. I'm a girl and i have an experience of female boss ruining my peace just coz of ego problems. Well, girls are misunderstood in some ways but in many ways, they are tough to be understood!
I apologise to all girls, if I was a bit harsh ! but let's face the truth!