What do guys think of girls with their belly buttons pierced?

I agree with the others. It depends firstly on yourself and on the guy. I would give a thumbs up to that.
Other than that,if YOU think it looks sexy. do it.

I think they're alright. If you have a nice stomach, then they're ok. I would take a belly button piercing over any other piercing besides ears.

They are ok.
No real preference

I'm getting mine pierced next year and I honestly don't care if a guy likes it or not. It's my stomach and if I like the way it looks then that's my decision. I think if you have a nice stomach most guys will go for it.

If YOU love it, then you love it. and a guy who doesn't like it, doesn't have the same taste as you, you get what I'm saying? Get it if you want it, and if you find out you don't really like it, take it out! But while you have it just remember to clean it a lot ;)

Depends on the guy. Some like them some don't. Also depends on whether you can pull it off or not.