Marvin Gaye - Lets Get It On

In this song theres basically one riff which is repeated 
almost throughout the song. Its variated quite a bit so 
I've tried to put the variations in as best I can.
The other section is a sortov breakdown/bridge thing that 
occurs twice in the song which is yet again is heavily variated.

Main Riff:
G----------------------------------------------
D----------------------------------------------   verse & chorus
A----6-----------------------------------------
E--------3--4--6-------------------------------

Variations of Main Riff:
G----------------------------------------------
D----------------7h8-7h8-----------------------
A----6-----------------------------------------
E--------3--4--6-------------------------------


G---------------------|------------------------
D---------------------|------------------------
A----6--------------55|6-----------------------
E--------3--4--6------|---3--4--6--------------


G----------------------------------------------
D----------------------------------------------
A----6-----------------------------------------
E--------3--334--446---------------------------


Bridge/Breakdown version 1:
G----------------------------------------------
D--------66-66---------------------------------
A--------------44-56---------------------------
E---654---------------3-334-446----------------


G----------------------------------------------
D----------------------------------------------
A--------------44-56---------------------------
E---654--44-44--------3-334-446----------------

There you go. Its easy to work out the structure. 
Any corrections would be good because I know its not exact.