Exactly how much nudity is in this series?

I wanted to try this series, but I was put off when I read on TV Tropes how much fanservice there was. But later I read that they were mainly talking about the manga; they toned things down for the anime and saved the stuff I hate (like nudity) for the OAVs and such.

My question is, just how much nudity is there in the TV show? I’m not counting the Movies and OAVs. I would really like to know this before I try it. And I’m only talking about nudity, I have no problem with showing people in their underwear, bikinis or other skimpy outfits. If only most anime series would just stop there, then I would have no problem getting into them.

Thanks in advance.