NOFX has been my brother's favorite band for at least the last twelve years. This poster hung on his wall for at least 4 of them. Though I'm pretty sure it was one of the big reasons why our Mormon cleaning woman eventually quit working for us, my parents accepted it -- along with several other offensive signs of his youthful revolt, including but not limited to: posters of the Dead Kennedys, Nuns with Guns, and of course that infamous 'patchouli scented incense' -- without question. They knew better than to make problems about it, I was mostly oblivious.
cut to little Hobbes: 'Hmm, looks like Calvin and his friends are on their way to the kitchen again; why's his room so hazey?'.
Wikipedia's entry on Animal Love is not nearly as accepting.