boyfriend's behavior, normal or not?

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I've been with my current boyfriend for about a year. We get along very well, and he is a great companion. There is just one thing: he watches and makes comments about other women all the time. Here is an example: We were eating dinner at a restaurant when our waitress came to check on us. As she left our table, his eyes were glued to her backside until she was out of view. Other times we will be in the middle of a conversation and he'll blurt out that a random actress is "sooooo hot". I'm not sure if he realizes he is doing it. Previous boyfriends were not like that. It doesn't bother me so much that he is attracted to other women. It's that he interrupts our conversations to stare at, or make comments about other women. This is pretty much a regular thing for him. It happens at least once or twice every time we are together. I don't think he would handle it very well if I did the same thing. What are your thoughts?