A movie with a pornographic theme. Porn movies are not just themeless sex, they also have actuation like any other movie. The porn fragments are frequently like this:

A man enters to a certain place, and a woman enters it too. No connection between them.
Suddenly, the man and the woman start to kiss, starting with a mouth kiss, then with a sensual tongue kiss.
The woman takes her shirt off, and later... she takes off her bra. Then the man starts to lick her nipples.
Then, the woman drops the man's pants and underpants off, and starts to have oral sex with him.
Scene switches, they are already totally naked, the man puts his penis on the woman's vagina, and then until the rest of the fragment.
They will keep having vaginal, frequently changing positions. If the movie is about anal, then it will be anal. Sometimes they alternate with more oral sex.
At the the man takes his penis out of the woman's vagina, she starts to masturbate his cock until he cums, which frequently is over the woman's face or mouth.

A porn movie that is shown outside on a giant movie screen and you sit in your car and watch it. there is a lot more privicy in a car. You can jackoff, fuck someone ect. while you watch it.
There used to be a lot of drive in movies but not for porn. Now they are switching to porn and more are being built.It is a great porn experence to see it on a giant screen ect.

The difference between regular porn and a porn scene movie is that porn is all about fucking,sucking ect. but a porn scene movie is just like a regular movie except it has sex scenes in it that are pornographic fucking sucking ect.