ogle at (one)
To stare at one, especially in a lecherous, lustful, or objectifying manner. Some guy at the bar has been ogling at me all night. Let's leave. I'm sorry, I really wasn't ogling at you, I was just lost in thought and happened to be staring in your direction.
ogle (at) someone or something
to stare at someone or something, usually with amorous or erotic relish. Don't just stand there and ogle at me! Stop ogling at those magazines.