Well, not everybody reacts in exactly the same way. Plus, there was no real opportunity if this was just a chance momentary encounter on a street. Plus people's reaction ability changes with age and other factors.
I gotta tell you -- I hope to be ninety and still appreciate a pretty girl. It is one of the great pleasures in life to sit around a table with a bunch of people, one of whom is a smart, witty pretty girl dressed to the nines, and have a good meal, tell some off color jokes, gossip, and debate the state of the world.