SIECCAN has put together several excellent simpler-language print based info sheets on sexual health for people with disabilities. The Sex Information & Education Council of Canada (SIECCAN) is a not-for-profit charitable organization established in 1964 that works with health professionals, educators, community organizations, governments, and corporate partners to promote sexual and reproductive health. This info sheet is about dating. It’s useful both for people with disabilities and for those who support them, giving nuanced but easy-to-understand framings of the topic.
You can download the pdf here.
You can find all the print and video resources on these topics at SIECCAN’s sex & disability resource page. (Note: while the page specifies that the resources are for people with physical disabilities, the resources are also very relevant to people with intellectual disabilities.)