It was pornography class, and there was a break.
Two adults were "having a good time" till the teacher says..
Teacher: Hey! SAY ALL THE NUMBERS TO 10,000 NOW!
Adult 1: How about I say my abc's?
Teacher: Go ahead, i guess....
Adult 1: A B C E F G H I J K L M N O P Q R S T U V W X Y Z
Teacher: Wheres the D?
Adult 2: Inside me...