Brian C. Hales gives overview of evidence for sexuality in some of Joseph's plural marriages.
Brian C. Hales, Joseph Smith's Polygamy: History and Theology, 3 vols. (Salt Lake City, UT: Greg Kofford Books, 2013), 2:379–392
[Hales categorizes the evidence for sex in Joseph Smith's plural marriages and discusses the degrees of probablity in each case.]