I love spy books, James Bond etc, and yet the life of a spy is (from what I know) a long way from how it is protrayed by Daniel Craig and Rupert PJ.
I have been vetted in the past (ex Services) and 2 (male) friends, plus my Dad's best friend were grilled about my love life, any abortions I might have had (I hadn't but if I had they wouldb't have known) etc etc. It is definitely intrusive.
My DH has spent a lot of time in submarines, and while I have a pretty good idea about where he has been, often he can't tell me.
Not for everyone....although my DS (8) is desperate to apply. He has got the general idea. Last time they were asked what they were going to be when they grew up, he said "I told the teacher Busdriver - I can't tell her I am going to be a spy!" Since then he has upgraded to "International Business Man". Sounds very dodgy to me!