“I didn’t want to think about his penis,” Grassle recalls in her forthcoming memoir, “ Bright Lights, Prairie Dust: Life, Loss and Love from Little House’s Ma” (She Writes Press), out Nov. It’s enough to make Reverend Alden - the virtuous pastor on the hit TV series “Little House on the Prairie” - choke on his Communion wine.Īctress Karen Grassle, who played Caroline “Ma” Ingalls on the ’70s and early ’80s show, has revealed how Michael Landon, who portrayed her wholesome onscreen husband, would openly talk about his “revived libido” on set.