Mathematical Kiss

A boy was teaching a girl maths. He kissed her and then kissed her again and said, "This is addition."

Then the girl kissed him back and said, "This is subtraction."

Then they kissed each other and both said, "This is multiplication."

Suddenly the girl's dad came and knocked the boy, slapped him, kicked him, beat him up entirely, threw him away and said, "That is called BODMAS!"