How do clam mate?

Answer 1

One clam opens it shell. Then the next. Then the male clam sticks it "tongue" in the female clams mouth. Then the female and male shut their shells. Then they start to do a "dance" Then they release their shells and continue as normal.

Answer 2

Female clams release their eggs in to the water at the same time the male clam releases his sperm in to the water. Some clams are hermaphroditic and can change their gender as they grow.