Two teenage boys are chatting.
"What's it called when three people have sex?"
"What's it called when two people have sex?"
"Now you know why they call me handsome."
"Mr. Smith, for someone with no experience, you are certainly asking for a high salary."
"Well... you must understand that the work is so much harder for someone with no experience."
A little girl was busy doing her homework.
"One and one, the son-of-a-bitch is two."
"Two and two, the son-of-a-bitch is four."
"Three and three, the son-of..."
Her mother heard it, and she felt so upset. The next day her mother stormed into the classroom and confronted the teacher.
The teacher replied, "Here in school we say: One and one, the sum of which is two..."
Rearrange the letters to spell out an important part of the human body which is even more useful when erect.
P N E S I
People who spelled SPINE would become doctors.
The rest, well, hmm...