OAP Oral sex

Two old age pensioners are enjoying oral sex together... but after a few minutes, the old guy says, "I can't stay down here much longer, it stinks!" The old lady says, " I'm sorry, it's my arthritis playing up again." The old guy replies, " You've got arthritis in your cunt?" "No" says the old lady, "the arthritis is in my arm, it means I can't wipe my arse!"