I stood at the last election as a PPC and I knew before I stood it is very male orientated. If you stand as PPC you need to be thick skinned and have 'balls of steel' hustings can be very daunting and the audience can ask you any question. One of the other PPCs who was a young woman, shy, and nervous was mauled to pieces by the audience, she was shaking, her leg was shaking! As said is not for the faint hearted.
Anyone who wants to enter politics has to know current politics quite well, and in my opinion be quite Machivellian. I found the other PPCs were either councillors or had been councillors. They all towed party lines and were ready when asked questions on certain subjects, in fact they said the same things at different hustings!
Also as said you need the time to do it, I did it, and I have children.
Elephantsandmiasma. You are quite right about the prying into ones private life. As a PPC I was put on display on a website and the public were asked "Do you know so and so, did you go to school with her, have you a story to tell about her?" and this is only for a prospective parlimentary candidate and not an MP. So yes, there are plenty of reasons women and some men will not enter politics.
It is a shame, because we need a wider spectrum of people entering politics. 