As far as it's not something offensive, you're just fine Read their ToS if you have any other doubts in the future or just drop them a message.
I had an ethical problem in using adsense for my christian blog. It seemed to me like making money out of my faith and i just couldn't bare it so i didn't use it in that blog
I have a religious-oriented site and routinely adsense ads about the Bible, God, Christians, etc. show up. So you should have no problem.