Journal of Discourses 8:115-116; “While brother Joseph was referring to the providences of God, I was led to reflect that there is no act, no principle, no power belonging to the Deity that is not purely philosophical. The birth of the Saviour was as natural as are the births of our children; it was the result of natural action. He partook of flesh and blood—was begotten of his Father, as we were of our fathers.” – Brigham Young, Salt Lake City, July 8, 1860
John 1:34-36; “And I saw, and bare record that this is the Son of God. 35 ¶ Again the next day after John stood, and two of his disciples; 36 And looking upon Jesus as he walked, he saith, Behold the Lamb of God!”
When the Mormons use the term “after the manner of the flesh” this is what they’re referring to; God had sex with Mary.