It depends what you're both interested in. Have you ever been into an Adult Store? There are many different types of Porn, many different directors too. You have your "Barely Legal", "Fetish", "Tropical", "Stories", "Anal", "Lesbian", "Orgy", "Oral", etc and you also have your "Top Actress" section - which includes people like, Gina Lynn, Belladonna, Jenna Jameson and Tawny Roberts.
If you're not embaressed about going into one of these Stores and discussing things with the worker then I suggest you do so. My friend works in a Porn shop and sometimes I go and help her out, people do generally seem a little embaressed but if you just open up and ask your question, you're going to get a good answer and a lot of advice and suggestions!
I would suggest for a start - anything with Jenna Jameson in. However, if you're into anal - then Belladonna is the one to go for.
If she's religious and only just warming up to the idea of watching Porn, then you could always go for the films that don't actually involve sex, there should be a section which I forget the name of - but it's all about fingering, oral and dry humping - there's no actual intercourse.
If you want any specific names of films then I could suggest a couple, but I think it's best if you choose together!
To love is to suffer. To avoid suffering, one must not love; but then one suffers from not loving. Therefore, to love is to suffer, not to love is to suffer, to suffer is to suffer. To be happy is to love; to be happy then is to suffer, but suffering makes one unhappy; therefore to be unhappy one must love or love to suffer or suffer from too much happiness. I hope you're getting this down.