This movie has some stuff that could help you, I guess. Not so many, but however, it emphasizes something really important about seduction: It's not about you, it's about her!
You can be anybody, if she's on her period, having a bad time, having a headache, even if you are friggin seducer no.1 her mood will affect the way she responds to you, so don't be so hard on yourself.

P.S: Sorry for any grammar or spelling mistakes ;)

Keep on, mates!