Funny - the first thing I thought of was Taxi Driver. I'm glad that I am not the only old man on Anandtech.
You know - there are some females out there who would appreciate the porno movie. Of course, nine times out of town they are a bit dodgy and not worth interacting with in a romantic fashion. But, the point is - they do exist.
I have actually had some females who requested that I rent a porn movie and the night turned out to be quite adventurous.
You have to make a smart judgement call when you pull something like this. I mean, you must be aware of what kind of female you are interacting with and what her mindset is like. You certainly wouldn't take a strict christian girl to your local satanic sacrifice ritual, would you..? Conversly, if the girl is very prissy, this is certainly not a good move and would certainly motivate her to cut off all ties with you. I agree with the previous statement - rent the English Patient or watch Skinemax late at nite with her (not with the homies around, preferably).
Of course, if her silence continues, maybe you could rent a porno and "relax" for a few minutes alone.. you know - just to relieve some stress.