I can tell you my experience with this issue
as a guy.

Certain adult films make me ejaculate much
quicker than with a girl, where it has been
an issue of not being able to keep erect
Long enough to finish the job. You can
Imagine this can create embarrssing
situations in the bedroom.

A doctor told me its not a hormone issue
since I get super erect from porn, but an
Intimacy issue. I will get hard initially
When she goes down on me and during
oral seems I finish quickly, but during Penetration
is a problem.

Porn creates an Escape that is often unrealistic,
Because certain positions dont work so well
in real life. either the girl is not into it or can't
Handle it like an actress who is trained would.

So solution is know your BF 's trigger points...Does
he erect quicker in certain techniques you use
vs others?

Once you know what drives him wild in bed,
And vice versa, neither of you will need porn
But will crave each other.