Good or Bad: All Estrogen All the Time?

I will be entering my 2nd year of teaching this coming fall.  I teach in a Catholic middle school with all girls.  I love the atmosphere of having a small group of about 45 girls and being able to connect with them.  But I have been wondering, and I have been asked this question by students, if it's a good thing at middle school age to go to an all girls school?  I haven't been able to answer this for myself yet because I can see both good and bad sides of the situation.  

The bad sides of all girls middle school is that it's the age of nastiness.  Girls at this age start to become aware of "popularity" and "coolness."  One thing my 6th grade girls say is that if you don't own an item from Juicy Couture then you're not cool.  They become so wrapped up in monetary items that they lose sight of what's really important, personality traits.  And of course it's always the mean girls that gain the popularity.  The ones that know how to manipulate those around them are the ones that the girls gravitate towards.  This is also the age of when girls start developing their attitudes and rebelliousness.  The girls sometimes feed off each other when attitudes fly.  When they are in heated arguments and discussions they can get very hot headed and forget where they are for a minute.  Another thing about an all girls school is that they don't get a boys perspective on things in school, especially literature.  Boys interpret things differently from girls and it is interesting for the opposite sex to hear other opinions.

The good side about all girls education is that the girls can reach for success with out worrying about what boys think or competing with them.  Some girls get so wrapped up in boys and what they think that they are afraid to challenge themselves academically because they don't want the boys to see them as a "geek."  Some girls may also still feel inferior to boys, due to how society has worked for ages, with men in top positions in the work force and with more power than women.  In girls schools the girls only compete with each other.  They are able to learn about successful women and strive to become those successful women.  Discussions are also able to flow freely and the girls feel less pressure and less inhibited.  As a health teacher, I am able to teach the girls about their changing bodies and answer all their "interesting" questions with out having to worry about making boys feel awkward about the conversation.  My students have developed a sisterhood that often becomes a family for the girls when they don't have much of a supportive home life.  We are able to be their support and encouragement.

One thing about all girls school, that I'm not sure if it should fit in a good or a bad category (you can be the judge), is the free sharing of bodily functions.  This includes belching and flatulence (oh yes, some girls freely fart).  For those that don't participate in this it's not pleasant because of obvious reasons, but it does lead to some funny situations at times.  Unfortunately I'm one of those people that find flatulence hilarious so I have trouble controlling my laughter when one girl breaks one.  But I guess it's good that the girls feel comfortable enough to let loose with each other and they do learn manners by saying excuse me.  

So what are your thoughts on the topic?  Is it good or bad at middle school age to have single sex education?