What is the “sexual content” referred to in Bubba Ho-Tep’s R rating?
I’d imagine it’s because Elvis needs to get ointment rubbed on his genitalia, which (a) leads to him hitting on the nurse who’s doing it; and (b) deciding to then apply the ointment himself, which leads to him masturbating.
Now that there’s been a serious answer:
Because he screws his mummy! Har har!
Hm. How graphic? See anything?
Nope, it’s tastefully (?) covered with blankets. But you can definitely tell what’s going on, plus there’s some voiceover narration on the topic.