yes, i totally agree sardine it's gross. I remember walking to school and being leered at constantly (20 yrs ago) as does mum (50 yrs ago).
However, i do think it's an education thing and dare i say it (gets ready for a flaming) a class thing. IME (purely anecdotal of course) working class males tend to like the younger, blonder, bigger boobed variety of mate. Think loaded, page 3 etc.
My dad and his peers feel this is fine but males i know from middle class backgrounds will deviate from these tastes, sometimes even to flat chested brunettes like me! My family have always considered me an ugly duckling really (despite being a model in my late teens) because i don't fit their stereotype of 'beauty'.
If i have ever tried to point out to dad/his mates how unpleasant their behaviour is they call me a middle class prude/leftie/lessie/jealous. You can't really engage with that. Last time dad did it when we met in a pub i told him firmly to stop, it was embarrassing to him, offensive to me and they didn't like it either and if he continued i was leaving. Sad really.
Mum says, as he's got older his tastes haven't and he still thinks he's in his 20s/30s but what the young women see is just a creepy old man. But of course 'she's jealous...' ggrrrr 