He explains, "Never share a bathroom with a woman. We've always had two bathrooms.
And Caine insists that the same mantra applies when he and Shakira check into a hotel.
"We book into hotels and we ask for two bedrooms and you see them thinking that our marriage is on the rocks, but I'm just trying to get another bathroom," Contactmusic quoted him, as saying.
Caine first spotted his former model wife in a TV advertisement and wooed her thereafter.