You can swim with sharks when you're on your period and bleeding and the shark should not be attracted to your period blood.
A shark that is gonna attack you will attack you regardless if they smell blood or not.
Shark attacks do happen but are rare but still I would never want to swim with a shark as that is just too risky.
But just be careful if you do swim with sharks whether or not you're on your period.
If you're on your period it's probably best to stay out of the water anyway.
The slowest shark is the Greenland Shark.
The Greenland Shark swims at around 0.34m per second which is slower than 1mph.
The Greenland Shark is also known to eat seals as well and dolphins can easily kill a shark.
The reason sharks are afraid of dolphins is that the dolphin can easily kill a shark.
Sharks seem more scary than dolphins but sharks have a good reason to be scared of dolphins because if a shark tries to attack a dolphin or a dolphins babies then the dolphin can easily and quickly kill the shark.
The way the dolphin can kill the shark is by swimming very fast and ramming the shark so hard that it dies.
Yes that's right a dolphin can ram into the shark and easily kill it.
The sharks body cannot take the blunt force from the dolphin ramming it's head into the shark.
So while sharks can be deadly to other things such as other fish and humans the dolphin is more likely to kill the shark than the shark is to kill the dolphin.