I would basically agree, but with a little extra. You should also respect his/her feelings. If you're with someone and they have a problem with it, it's only right to stop. I'm sure you'd want the person that you're with to respect you opinions and feeling, right? You should do the same or find someone else that doesn't have an issue with it. And I think that goes for a lot more than just crushes. Now I know we're all human, so if you see something you like you're gonna take notice. But does that mean you should point it out or make a big deal of it? No. Online is just like walking down the street. You might see someone you think is attractive, but you shouldn't tell your partner "Wow! Did you see that guy/girl?"

Just my 2 cents