Robert-
I disagree. A very large number of Americans will refuse to use Wikipedia if it contains color photographs of penises, vaginas, anal sphincters, etc. If we do not have at least some level of protection, then we will become one of America's most-blocked site on home and school Internet filters.
We've gone through this before. My point of view is that we have no obligation to pander to filters - we have an obligation to be an encyclopedia. Being overly offensive hurts our usefulness as an encyclopedia, but being in the filters is not an indication for being overly offensive. A lot of stuff is put in filters that is not offensive by any reasonable standard.
Perhaps main articles should have no such images, but can contain a link to a related article with such photos.
I find this to be an implicit endorsement of the shamefulness/sinfulness POV that has some prominence in American culture. NPOV should be paramount except for cases of near-universal offensiveness.
We should probably formulate a policy on this. On Talk:Clitoris there was a near consensus for including either a photo or a drawing, and a slim majority for a photo (although no suitable free illustration has been found yet). I do not see a fundamental difference between clitoris and penis in this regard. So it appears that the vast majority of Wikipedians favors liberal standards of inclusion rather than conservative ones.
Regards,
Erik