Brian C. Hales reviews details of Joseph's marriage to Helen Mar Kimball; concludes sex was most likely not involved in the marriage.
Brian C. Hales, Joseph Smith's Polygamy: History and Theology, 3 vols. (Salt Lake City, UT: Greg Kofford Books, 2013), 2:294–298
[Brian C. Hales reviews the sources pertaining to Joseph Smith's marriage to Helen Mar Kimball; he concludes, after reviewing the evidence and past authors, that the marriage most likely did not involve sexual relations.]