ELAC
"...first officer also log PIC time whenever you step out of the cockpit for a call of nature?"
A stupid statement from a person who has demonstrated some intelligence and knowledge.
Woodja may wish to confirm this... my understanding is that the CSA Expats captains do not have their log books signed by the other Captain, in fact the Expat captain often signs the FOs' logbook.
ELAC, Air China is obviously less progressive than CSA.