That was always a sticking point for me when I was a Mormon. One of the last adult Sunday School classes I attended was a discussion about sex in heaven...some were pointing out that since we would produce "spirit children," wouldn't it make sense that it would be sexual reproduction.
AND since heaven would be pleasurable, didn't it make sense that we would have marital relationships in heaven?
This was during the time I was seriously questioning their dogma, and it was one of the final straws. Again, it's just one of the many unbiblical teachings of the LDS. Then again they've been given the fullness of the gospel through continued "revelation."
I surmised the truth would be established through two witnesses, and I would trust there would be congregational confirmation on such important changes, moreso if the new 'truth' was contrary to previous teachings.
Maybe I'm just not all that familiar with all the nuances and interpretations, if there are supposed to be any private interpretations.
Not knocking anyone personally for their beliefs -- just questioning the wisdom and the process of altering the course and placing obstacles in a well-trodden path.