Social Signals ($159.oo) is a series of  videos and curriculum are designed to teach adolescent students with autism and intellectual disability about safe relationship skills.  There is also a parent curriculum for $23.99.  They have a sample video and lesson available for free so you can preview before you purchase.  I liked the video.  I like to teach about expected and unexpected behaviors and I think these videos could be a good tool.  There are also sample lessons that accompany the videos.