Ms. Gillian flattened her cloths one last time. Then she stood up straight and entered the classroom.
As usual, the students were loud and didn't notice her entrance at first. Only when she slammed her books on the table, they stopped talking to each other and went back to their seats.
After everybody was sitting, she cleared her throat and then started talking:
"Welcome, students. Most of you should know me already, for the others, I'm Ms. Gillian. You probably have some questions about this subject, that is marked in your schedules simply as 'health education'. Actually, the subject is called 'sexual education'."
A commotion started in the class. Some of the students began to whisper to their neighbor, some started blushing red and some started laughing. Ms. Gillian knocked on her desk a few times till the ruckus finally quieted down.
"I'm sure at least some of you already have some experience in this subject, but due to some 'law restrictions',"
she emphasized the words, so the students could clearly tell what she was thinking about that matter,
"we aren't allowed to teach this subject to people under 18 and have to assume, you're all totally new to anything regarding sexuality, so you have to bear being treated according to this."
She paused one second, as laughter started anew. She waited patently till it subsided, then she continued:
"With that out of the way, let's finally start with the lesson. In Sexual education I will teach you about the difference between males and females, especially the differences between both sexes, some functions of your body, personal hygiene, reproduction and the sex act. Are there any questions?"
One hand rose.
"Yes, you!"
"How many tests will we write?"
"There will be no written tests. Your final grades will be composed by your oral grade and your cooperation in class."
When she said this, a murmur started to sound through the room.
She smiled, when she added: "Of course this doesn't mean, I don't expect you to learn and I will regularly check your homework. So don't think you can slack off! Are there other questions?"
No hand rose this time.
"Fine, then to today's topic. First I need a guy. Any volunteers?"
Still remembering her words about grades depending on cooperation, a few hands were reluctantly lifted into the air. She looked intensively at every of the guys before she chose one: "John, would you please come in front of the class?"
The addressed guy stood up and came to her.
"Now, John, would you please take off your clothes?"
Slowly John began taking of her clothes as instructed, though he didn't seem very pleased about it. Finally he stood there with only his shorts still on.
Ms. Gillian shook her head: "I meant all of your clothes!"
"But why?"
"You'll understand afterwards."
Hesitatingly John pulled down his shorts. Now completely naked, he stood there and was watched by the whole class. Some of the students giggled or whispered to their neighbor.
"Please be quiet. I will tell you now about the male anatomy. I'll use many words that may be new to you, but you don't need to write them down, as they are all in your books, so please concentrate on what I'm showing you."
She pointed at John's dick.
"First, this thing hanging down here is called a penis. Usually it's also referenced as 'dick' or 'cock'. It's used for urinating and in sexual intercourse
The bag beneath it is called the testicles or simply 'the balls'. It's where sperm is produced and stored till it's used. I'll come back to that later.
See, as how John's penis is rather small and hanging down at the moment? That's because he's not sexually aroused at the time and a little embarrassed about you all watching him."
She reached one of her hands out and grabbed his dick and started moving her hand up and down along it. He soon reacted as expected. When it stood halfway up, she stopped and continued talking to the class:
"As you can see, at the moment his penis is increasing in size. That's because interaction with it is recognized by most males as sexual stimulation. There are other areas of the male body that are sensitive to sexual contact, but the penis is usually the most responsive.
When the penis is in this state of standing up, that's called an 'erection'. The length and breadth of the penis in this state differ from person to person."
She resumed stroking Johns cock till it finally reached its full length, then she stopped again.
"This is the final state. See as the foremost part isn't covered by skin anymore? The skin there is called foreskin and usually only disappears when the guy is in sexual activity. Though there are people where the foreskin was cut, due to medical or religious reasons. That's called circumcision.
Now, there is a drop of liquid coming out of the slit on the front of John's penis. This is called pre-ejaculate or, more colloquially pre-cum. Its function is to work as a lubricant during sex as well as aiding in sexual semen entering a woman.
Now please watch John closely."
She turned back to John. While she used one hand to stoke his cock, her other one played with his balls. Soon John's panting indicated he was nearing climax. When his cock finally begun to tremble, she took her hand away from his balls and hold it out in front of the penis, where she caught his cum.
"What you just saw was called orgasm or climax. At the peak of sexual excitement a man spurts out this white liquid with high pressure, so it enters the woman's body. This liquid is called sperm, semen, ejaculate or simply cum. Sometimes it's even called jizz. It's the male's contribution on sexual reproduction. We'll talk about the details of it in another lesson. For now let's take a close look on this sperm. By the way, John, you may dress again. Thanks for your contribution to our lesson."