didactic \dy-DAK-tik; duh-\, adjective:
1. Fitted or intended to teach; conveying instruction; instructive; teaching some moral lesson; as, "didactic essays."
2. Inclined to teach or moralize excessively; moralistic.
In class, embarrassed girlish laughter joined the "hee-haws" of our male classmates when centerfolds appeared in the middle of medical lectures, ostensibly to add a wake-up jolt to otherwise uninspired didactic presentations.
-- Frances K. Conley M.D., Walking Out on the Boys