I asked my self several times about why i should write on this topic. I have thrown it away several times until I recently had a counselling session with a lady who wants to break up with her boyfriend because of how he behaves during sex. It was weird and she didn't understand. She said the guy's face becomes like horror.

Here are some few reactions when people reach orgasm.

1. Horror face
This is common among guys. Some guys have a funny face when they reach orgasm and it's as if they are in pain and enjoying at the same time.

2. Bite Bite
Some people when they reach orgasm prefer to bite their partner before they feel okay.

3. Scratch and win promotion 
Some people also scratch their partner when they reach orgasm. For many people they get the scratch at the back or on the neck.

4. Tears of joy
This one is very romantic but can be very confusing. Some people start crying when they reach orgasm. If you know how it works then you will relax knowing youve done a good job but not when you don't know. You will start asking silly questions like...dear what did I do? I'm I too big for you? Did I make you remember something bad? Do you regret doing it with me?
It should also be known that it isn't all the tears that are for joy...Some are actually for PAIN. learn to check or ask if you are in doubt.

5. Silent killer
Some people do not have any expression at all. They have the same face from start to finish. They are usually asked....are you enjoying it? Did you enjoy it?

6. Vibration 
For some people they begin to vibrate when they reach orgasm. This is the most commonest. There are different degrees of vibration...from mild to severe. Some it occurs just at the waist, others it's at the legs and for some the whole body.

7. Strange names or statements 
This is what some people call...speaking in tongues. Some people say things which after the sex they don't recall saying and some what they say is strange. Some mention names which has no motive but for some, further investigation will reveal that the name mentioned is the ex. Usually when the new partner does it like the ex it triggers memory and the person feels like having the sex with the ex. If this happens it means the person is not completely over the ex.

8. Super Hug or Grab
During orgasm, some people give a massive hug and holds on for some few seconds or minutes before they can let go. For others, they grab whatever is within their reach but usually it's the bedsheet or the pillow.

9. Promises and Eulogy
Some guys after reaching orgasm begin to make all kinds of promises. Some people cannot even remember what they said after some few minutes. I was told a guy promised to buy a jet as a birthday gift and the lady told him to start with a bicycle since he is not working. 
Others sing all kinds of eulogy or praise. They say all the sweet words in the world after orgasm.

10. Squirting 
Some ladies produce a fluid from the vagina as if they are urinating when they reach orgasm. This can be embarrassing for the lady if she is having sex for the first time with the guy. Some guys who do not understand or know this think the lady urinates during sex and some break up because of that. It shouldn't be so.

NB: Just understand that people have different reactions when they reach orgasm so dont have one expectation for everybody.