Same as when you get a dog, and all the other dog owners notice you.
You probably have a reputation now and the girls see you differently than they did before.
Because now they know you are no longer an item!You now have the ol' ball'n'chain!.....Sorry,I'm kidding!I had to say it!Could be they see more of the man than the boy!!!
Instinct. The female of the species is genetically programmed to seek a mate and reproduce. Also we think babies are cute. Animals work as well.
babies are so cute and young people think they are toys.