Lolita
 

I haven't watched it in a long time.

Lolita tells Humbert that Quilty wanted her to be in an art movie. Is she referring to a porno?

Yeah. With boys and girls. The idea being that Quilty's a perv but Humbert's lust is pure.

Or that for Humbert it's love and for Quilty it's lust.

I think that both the novel and the movies that it spawned are terrible crap.