I think you're right that jokes don't have to be vulgar, to be funny. No harm in keeping it classy, when possible. I usually won't upvote bathroom humor or jokes about sex etc, unless there's something extra in them that's witty.
I also think you're right about keeping in mind that there are young people on here too.
Hey did you see this one, by the way (not NSFW, just a Bad Pun meme on a funny new template). I thought you might find it funny:
imgflip.com/i/17gkq2 :)