E.L. James launches official Fifty Shades Of Grey Christmas lingerie and sleepwear range at Tesco

Back in July, movie fans got a glimpse of Anastasia Steele and Christian Grey in the teaser trailer for "50 Shades of Grey," coming to theaters next Valentine's Day.

Now, in a longer trailer released Friday, they get more glimpses into the characters who fans of the "mommy porn" phenom have long envisioned on the screen - with a bit more backstory and, um, bare backs.

The extended trailer peaks at Christian Grey (Jamie Dornan) in "boring mode," as Anastasia (Dakota Johnson) refers to him: Going for a run, emerging from a limo, holding forth at meetings and choosing expensive clothes (that proud musculature is from all the running, no doubt.) Anastasia's more simple closet is shown in contrast, as is her life as a student. These two come from different worlds, clearly.

Then it's to the characters' initial confrontation in an office and protestations from Grey ("You should steer clear of me ... ") as walks and drives in the woods symbolically bring us deeper into the tale.

The sexy stuff? That's brief and in the final third of the two minute-plus trailer.

Clearly, for all the boundary-pushing sexuality and S&M images, part of director Sam Taylor-Johnson's take leans towards a classic rom-dram "opposites attract" tone.

Yes, there is foreboding music drowning out Beyonce's "Crazy in Love" tune when the couple enter the hero's infamous "red room," but the notes struck. "Why are you trying to change me?" "I don't know if I can be with him the way he needs me to." Those lines are familiar to fans of the genre.

Which is an important point, since, like the release date, the new "50 Shades" trailer is sending a signal to moviegoers that for all the expected transgressions, there's still something romantic watching opposites who attract.

Even if one of the parties finds super-deep meaning in buckling up the seat belt in a helicopter.