Perhaps have a user setting for the likes of Ken who are squeamish about dragon cocks, for them the font size of the post in question could be increased or decreased by 1 for each like/dislike the post receives.
If I was going to add it, I'd do a up / down vote thing but rather than the promotion system Slashdot have, which I agree wouldn't really work with Beehive's threaded structure, I'd probably go with something like Eurogamer's comment system where you have a user definable threshold (which would be a combination of total score and number of votes) and if the score goes below this the posts are hidden. Kinda like a social ignore list.
(This of course would be optional and you could choose not to set a threshold)
The comments on Ars Technica have a similar system, and it works well there too – comments with more than 20 downvotes get collapses automatically, unless they also have a similarly high number of upvotes.