The one female teacher I alluded to above was in the science department. Mrs L was a biology teacher. Of course! I don't know why she was employed at the school when no other women teachers were but at a guess I imagine the fact that her husband was a teacher in the same department was a relevant factor. Mrs L was probably aged around 40 at the time but to our youthful eyes she seemed positively ancient.
Stepping momentarily away from the point of this posting and moving forward about forty years I visited the school with a group of old boys (Andrew, the appendage observer, please note) from my year and found women teachers in abundance. Times have changed.
But back to my school days, it fell to Mrs L to deliver the euphemistically titled facts of life session to class after class of male pupils. I think the session occurred in Year 7 when we were aged around twelve or thirteen. Already sexually 'experienced' there was still plenty - maybe everything - for me to learn about sex, especially of the heterosexual variety. So despite our giggling childish reception to the lesson it served a useful and important purpose.
It was the session's conclusion however that delivered the knock out punch. Mrs L concluded each of these sessions by informing the pubescent audience that by now our testicles should have dropped. In a dry and unemotional monotone Mrs L announced 'any boy whose testicles have not yet dropped should stay behind class and see me'. I have no idea what happened to any boy who did so but we couldn't get out of that classroom quickly enough once the bell rang.