Personally, I don't think people actually find porn "offensive" so much as so taboo that they go into a nervous frenzy. So, my stance is that I don't care if someone has porn in a map. In fact, I think it'd be entertaining to kill people who get distracted by it XD
As for the age thing, I think that also has to do with how taboo porn is. There are tons of teens who look at porn, and I'm pretty sure that most of them have not become sluts and pimps. The real damage, in my opinion, comes from socializing everyone into subconsciously fearing the topic of sex.
I do realize that there are laws regarding porn (and copyright, for that matter), so whoever makes maps with porn in it should, for their own legal safety, learn those laws and abide by them; I'm not in any way saying to ignore the laws and do whatever, I'm just saying that the laws are, in my opinion, baseless.
Also, it doesn't really matter where the porn is in a Tremulous map because anyone can just unzip the pk3 and grab the images. Just sayin.
Age: 17