Dirty old man

In Spain I had one professor who was known as a dirty old man. He was already close to retiring age and walked limping. I had him as a professor in two subjects. I think that he was a nice man and he was telling jokes in the lessons but his behavior towards girls could be considered as a sexual harassment. Sometimes he held hand with the girls, asked them to come up to show some example and he kindle touched them to shoulder or arm. You could see that he liked good looking girls. When I asked from any Spanish student that do you know the dirty old man everyone knew immediately about who I was talking about.