I had a date last week with a gentlemen who said he'd love to have me meet him at the adult movie theater and pull a train.

I am imagining a conga line of naked guys but am not sure if thats what he meant.  
And I searched the newbie guide and couldn't find the reference to "train".

think 3 trains and you are the middle train...

...See definition number one in the link for the origin of the phrase.

the "gentleman" you think he is . . .

okay, I got it now.  Its not quite what I was imagining - I was picturing everyone linked together. lol!

Now that I'm enlightened, I know what to say the next time someone brings up the idea of having me be the conductor of a train pull.  (A big NO Thank you).