Pulled this together quickly for someone on Youtube, he suggested I shared it with 
everyone, and that seemed like a damn good idea.

The start sounds like single notes, I hear:

e|----------------------|
B|----------------------|
G|----------------------|
D|----------------------|
A|-------------------3--|
E|-3-3--5----1-1--------|

Then he plays some chords, I get it as:

F (133211@1)               G (320003@1)           C (x32010@1)  I'll never get naked in your shower
F (133211@1)               G (320003@1)            C (x32010@1)  I promise I'll always wear my clothes
F (133211@1)              G (320003@1)         C (x32010@1)                   Am (x02210@1)  I'll only get naked in my shower, behind closed doors
F (133211@1)               G (320003@1)       C (x32010@1)  I'll never get naked in yours

Then I think it's the first bit again with some 5ths added:

e|-------------------------|
B|-------------------------|
G|-------------------------|
D|----------------------5--|
A|-5-5--7----3-3-----3-----|
E|-3-3--5----1-1-----------|

I think that's all there is to it, everything else just repeats one of these sections, I think.