If you need signs then there is the BSL & Makaton
https://letssign.co.uk/product/lets-sign-bsl-signs-for-sexual-relationships-education/
https://makaton.org/ItemDetailResourceVocabulary?iProductCode=RVM04B40
There are also some free resources at Learning for Life (which is a new project covering personal health, emotions, relationships, and appropriate behaviour. We will be releasing new material in sets of videos covering particular areas of need for our community), see https://www.learnandthrive.org.uk/learning-for-life