Sharks don't have mates. Sharks just eat. It was trying do decide if the kayak was edible or not. No one has ever seen a shark mate, I don't think. It happens very deep underwater. They are very mysterious. Did you notice the dude in the snorkelers boat call it a very large "animal?" I've noticed them calling them "animals" lately, I suppose to try to get us thinking of them as just another animal with "rights" instead of as a killing machine.
Sharks do mate. Hence, little sharks that grow into big sharks. It doesn't appear they mate for life, though. It appears mating may involve a bit of violence [scars noted on female shoulders] Some have live births, some lay eggs[Great Whites have live birth]. Read once that some scientists believe at least some of the Great White population pups off New York.