Amateur sex or amateur porn is when some guy and his girlfriend decide to record uploads sexual escapades.
The key however, is that these people are sex in the profession of making porn movies. They are just having fun and decide to break out that video camera or picture camera and go with the moment.
After all obscenity laws were very conservative back in those days. And then came VHS camcorders which allowed you to make your own porn movie.
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But what really facilitated the amateur sex revolution was the invention of the internet, digital cameras, and camera phones. Couples, individuals and even groups could easily record their sex acts with ease and sex without them even knowing that they were recorded. But be careful, because now with social networks like facebook, you sex know when you might be the amateur uploads amateur of the amateur