A passing thought

Today I realised that I know the following facts about ALL my 8 female colleagues in the HR department:
-the date of their last period
-the make of the perfume they use
-their pet-hates
-whether they would rather have a three-some with two guys, a guy and a girl, or two girls.


Today I also realised that I know the following fact about NONE of my 8 female colleagues in the HR department:
-what exactly they do between 9am and 5pm, Monday to Friday.