There is actually a logical explanation why the wolf boys are half naked for the entire film and that's because as shapeshifters they are hot blooded and also all the transforming means they go through a lot of t-shirts. My cousin who has read the books explained this to me but what about pants and shoes?
Human Bella loves vampire Edward. Edward loves her so much he lies and tells her he's breaking up with her to protect her from the dangers of vampire life. While he's gone she starts a relationship with shapeshifter Jacob who is the opposite of Edward and voila love triangle.
You can read between the lines here to make it more interesting - Jacob becomes a shapeshifter (goes through adolescence) Edward won't change (sleep) with Bella until she's older and they're married. She tempts him just by being a woman (he might not be able to stop and go all the way) or you can just sit back and think of first love, it's a romantic drama after all. Meyer who wrote the books is a morman and doesn't believe in sex before marriage so it's the abstinence of this film that makes eveything exciting and the electricity of small gestures that young people can relate to.
This all proved too much for a dad in the theatre who started snoring loudly and I was a bit restless throughout the repetitive "I want to protect you" scenes however there is a standout scene in the forest set to spooky "I'm a creep" Thom Yorkes' Hearing Damage, with the wolves running down vampire Victoria.
NO - unless you're under 15 or a virgin or have a massive crush on someone or just starting a new relationship.