Why put the entrance tothe Chamber of Secrets in a girl's bathroom?

[vmonte]

No: HPFGUIDX 88282

vmonte writes:

Just a thought here.  Why did Salazar put the COS in a girl's 
bathroom?  Was he specifically waiting for a female heir to open the 
chamber?  Was the choice of Ginny (instead of another Weasley) random 
or intentional?  Are the Weasley's descendants of Slytherin?  And 
have they made the choice (like Harry did) to be more like 
Gryffindor?  

vmonte