I thought I would show some lighting set ups I've used to give me some flexibility in where I could shoot from during a set. Lighting is tough to teach as a lot of it depends on locations. A small room is tough to light properly, white walls with give a different light effect from dark walls, the style of the scene is also going to change the lighting set up.
Lighting techniques are many and most shooters use different set ups.
These set ups can be used for video, just change the lights to Tungsten or Fluorescent Lights. Which are good in the summer with people having sex. But not that strong and hard to control.
Here's a few suggestions.
A. Is my key light and I set it at least 5 foot high, to eliminate reflected light bouncing back into my lens and so I could stand underneath it. It can have a shoot through umbrella, bounce umbrella, soft box or a dish. I liked the dish best.
B. Is a pussy light with a small soft box low on the ground and aimed at the pussy.
C. Is a side light, into an umbrella and high aimed down at the model. Slightly behind to give some light to the rear.
D. If you have the space and can wet it up is a rear light high, aimed down at the model and with barn doors and a snoot.
E. If you have the room and location is a light behind the sofa/bed and used to separate the model from the background.
A and C are essential IMO. B is good. D and E are optional.
The red lines are where the shooter can stand.
If you have the width this is a good set up.
Gives the shooter more space to move around.
As I said all lighting set ups can vary to the style, niche, location, content, etc. The only way to learn is to do it over and over again or get a job assisting a good shooter. Getting good lighting for what you're trying to do is important. Eliminate shadows, depth of field, sharper image, etc. Also the model knows you know what you're doing if she sees you have lighting her mastered.
Lastly. GET A LIGHT METER AND USE IT. Using the screen on your camera, laptop, computer is never going to teach anyone anything about lighting.