One of the things to notice in this article in the San Fran Chronicle is how carefully all the parents are to remain anonymous - even questioning the tour location is something they fear they must do in private, rather than being "outed" as "bigots" - when actually they are simply concerned about preserving their children's innocence:

Last week, second-graders from San Francisco's private all-boys Town School strolled through the Castro, the city's world-renowned gay district...

... Last week, one of those parents contacted the CBS News desk and CBS 5 Eyewitness News featured a segment highlighting the controversy. The mother, who remained anonymous on the show, said: "Why would you talk to a young child about sex with a man and a woman let alone a man and a man or a woman and a woman? It just doesn't seem right. They are not ready for that.

...[And] what about the Castro's infamous sex shops? Those adult-oriented stores with provocative window displays featuring sex toys, nude images, pornographic movies, and a dizzying array of sexual items from phallic pasta to stripper poles to whips and chains.

These shops weren't highlighted on the tour and the guide mapped out a route that aimed to avoid them all together. Still, the Town parent who reached out to SFGate expressed concern about the children walking by these stores.

*SFGate was in touch with two Town parents for this story; both asked to remain anonymous.