In the mighty Tin Triangle, 'relief facilities' consisted of a football bladder connected to a metal top with a hinged flap to prevent what had gone in coming out before landing.
Not much use for the ladies though.
One day we took a visiting WRAF officer flying and explained that the facilities hadn't been designed with ladies in mind. However, we told her that a 'WRAF adaptor' was available - this was one of those huge funnels normally used for adding oil to a Chipmunk engine, which would be inserted into the metal top of the pee tube. Fortunately she realised that this was a leg pull and that the message was 'go before you go', so that the problems of getting out of an immersion suit before taking aim were averted! And she enjoyed her Vulcan flight without any discomfort.