There is always an element of stupidity as much as the sex in these sorts of things. I mean it's not the first time an older man with an important gov. job has been seduced by a sexy, foreign spy. I believe that's what the Profumo scandal from the sixties in England was all about. The same thing in the movie "The Day Of The Jackal."
How stupid (or how egotistical) do you have to be if you're pushing retirement and a sexy young thing comes on to you and you don't think she might be up to something other than loving your for your incredible studliness? Pretty stupid.