I did a lot of pirating my freshman year of college and after that I said I would try and buy everything legally. The few things I feel morally fine pirating are:
1. E-books that I already own in hard copy. Really, I'm not spending another 10 dollars per book to buy something I already own.
2. True Blood and Game of Thrones. I have HBO at university but not at home and since HBO doesn't have any kind of cheaper streaming service, I feel like they screwed themselves over. I can't afford to buy HBO at home for only a few months out of the year for one or two shows.
Overall, I think pirating is harmful. Artists put a lot of time and energy into their work (shows, movies, music, books) and if everyone is pirating, they don't see any financial support from that. I think sometimes letting people borrow a CD or a book can lead to them purchasing more of that artist's materials, but I think that's just as likely as those people asking you for the rest of it.