Well...I'm not sure where it comes from or even if it's actually Biblical but there is a belief among some of the end times nutcases that everybody gets a new body when they go to heaven. I think this is because in Revelation it says somewhere that there will be no more pain, tears, etc. etc. and of course no sex or anything like that in heaven. It's been my experience that when people come up with beliefs like that they're extrapolating i.e. because the Bible says people won't get married in heaven that must mean there will be no sex.

Read the last couple of Left Behind books and you'll see just how disconnected with reality such beliefs are.