It's C and G for the whole song.

C G C G

C (x32010@1)                GI (320003@1)know I shouldn't think about you
      C (x32010@1)    GBut (320003@1)I do
C (x32010@1)                   GCause (320003@1)this morning, I woke up wet
      C (x32010@1)    GYes (320003@1)I do
C (x32010@1)             GYou (320003@1)and I doing bang bang bang
       C (x32010@1)                   GIn (320003@1)the back of your mother's car
C (x32010@1)                  GFor (320003@1)hours we did the same same same
 C (x32010@1)                   GAgain (320003@1)in the other car

(C G C G)
Ohhh Oooohhh

C (x32010@1)                GI (320003@1)know I shouldn't talk about you
      C (x32010@1)    GBut (320003@1)I do
       C (x32010@1)               GI (320003@1)say "Oh my god, he's so fuckable"
       C (x32010@1)    GYes, (320003@1)I do
C (x32010@1)                   GAnd (320003@1)you said that you love love love
   C (x32010@1)                        Gmy (320003@1)ass, cause it's really big
C (x32010@1)              GSoftly (320003@1)kissed my bum bum bum
  C (x32010@1)            Guntil (320003@1)you fell asleep

(C G C G)
Ohhh Oooohhh

C (x32010@1)                    GYou (320003@1)say "Oh please come closer, whisper in my ear"
      C (x32010@1)    GAnd (320003@1)I do
         C (x32010@1)                    GYou (320003@1)say "Scream my name louder, tell me you love it"
      C (x32010@1)     GAnd (320003@1)I do
C (x32010@1)         GSo (320003@1)you move faster and faster
C (x32010@1)                     GJust (320003@1)like a sex machine
C (x32010@1)          GAnd (320003@1)I scream louder and louder
CI (x32010@1)LOVE YOUR DICK

C (x32010@1)                GAnd (320003@1)now when I look at you
    C (x32010@1)            GI'm (320003@1)red like a tomato
  C (x32010@1)               GI (320003@1)hardly articulate "Hello"
    C (x32010@1)           GAnd (320003@1)I'm so ashamed
      C (x32010@1)               GCause (320003@1)every night every night
  C (x32010@1)               GI (320003@1)see you in my wet dream
    C (x32010@1)             GYou (320003@1)are just like a porn star
      CAnd (x32010@1)I suck your cock like a whore

C (x32010@1)           G (320003@1)              C (x32010@1)       GI (320003@1)feel like a whore when I see you in my dreams
C (x32010@1)           G (320003@1)              C (x32010@1)           GI (320003@1)feel like a whore when I see you in my wet dreams
C (x32010@1)           G (320003@1)              C (x32010@1)       GI (320003@1)feel like a whore when I see you in my dreams
C (x32010@1)           G (320003@1)              C (x32010@1)           GI (320003@1)feel like a whore when I see you in my wet dreams...

Ohhh Oooohhh