Is marital intimacy on the Sabbath a violation of the commandment to keep the seventh day holy? That depends on who you ask.
The Book of Jubilees is not Inspired Scripture
Jubilees is a fascinating book that provides a window into the world of Second Temple Judaism. However, instead of appreciating it for what it is, a few teachers on the Internet exaggerate its significance and consider it to be inspired Scripture. This article provides an overview of the Book of Jubilees and explains why it is not Scripture.