I'm sure most men can recall the first time they noticed girls in a sexual way, here's mine.
I was about 13 or 14 at the time and it was in the mid 1960s. I was watching the old film Lucky Jordan from 1942. I had never been interested in women up until this point. In the film a young woman while seated with her legs crossed, distracts a man's attention by edging her skirt up a little at a time, so that he can see more of her attractive legs.
I remember thinking to myself “yes, I do like that!”
From then on I became a real lover of female legs, I started to keep a scrap book of legs I liked, cut from newspapers and magazines. At this point breasts didn't do anything for me.
I liked to see legs in elegant dresses, not too short, a few inches above the knee, with nylons and heels. I loved the way women walked, dressed that way, I loved the sound of the click of heels and to see women seated with their legs crossed.
Many years later I was fortunate enough to have a girlfriend with lovely legs who was very happy to sit in front of me and tease me with those wonderful legs!
Maybe others can recall the moment they first noticed girls?