Are you sure about that?
"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." (Journal of Discourses, v. 8, p. 115).
AND
"The birth of the Savior was a natural occurrence unattended with any degree of mysticism, and the Father God was the literal parent of Jesus in the flesh as well as in the spirit." (Religious Truths Defined, p. 44) as cited in the book, Mormonism: Shadow or Reality, by Gerald and Sandra Tanner, Utah Lighthouse Ministry, P.O. Box 1854, Salt Lake City, Utah 84110, Bookstore at 1350 South West Temple. 1982, page 260).AND
"Christ was begotten by an Immortal Father in the same way that mortal men are begotten by mortal fathers," (Mormon Doctrine, 1966, page 547.)AND
"In relation to the way in which I look upon the works of God and his creatures, I will say that I was naturally begotten; so was my father, and also my saviour Jesus Christ. According to the Scriptures, he is the first begotten of his father in the flesh, and there was nothing unnatural about it." (Journal of Discourses, v. 8, p. 211)
So who is lying? Me? You? The Mormon church? Someone out there is teaching that God had sex with Mary.
I suggest you look into the difference between BIRTH and CONCEPTION. Not one quote there talks about how Mary concieved, they only talk about the RESULT of her miraculous conception, and you can find those same leaders also asserting the miracle of the virgin birth in those very same works those quotes are pulled from.