I will later explain the practical need behind my question; I need to go to sleep now, so I will just present the issue without further ado.

One of the gaps in my education was totally missing out on the whole American tradition of making out in parked cars.

Neither I nor the boys around me owned cars when I was young; holding each other gently in subway trains was all there was to combining boy-girl relationships with means of transportation.

Well, not all; in really packed commuter trains, I kept my would be first husband on the brim of ejaculating but not quite ejaculating a few times, and he did find it both torturous and pleasurable at the same time. OK, now that really was it and nothing else ever happened in any car, be it an automobile or a car that is a part of a train of any kind.

Later, in America, I learned the expression "to make out" and formed an idea of what "making out in a car" means.

Today, consulting with a dictionary
make out - definition of make out by the Free Online Dictionary, Thesaurus and Encyclopedia.,

I discovered the following:

make out

8. Slang
a. To neck; pet.
b. To have sexual intercourse.

So my understanding of this phrasal verb was (a) and solely (a).

I thought that (b) was specifically excluded from the scope of "making out". Apparently, there is some ambiguity that I was not aware of before.

Could someone who is in the know please shed light on the issue?