The US obscenity standard (Miller v California) uses a LOCAL standard. While those items you mentioned may be okay in more 'liberal' areas like San Francisco it MIGHT get you in hot water in the Bible Belt. Here's Attorney P Cambria's list re possible obscene materials:
http://www.stcl.edu/faculty-dir/berg...ria%20List.pdf
Definitely consult with a 1stAm attorney, though.