I have to say, I loved SHIVER. I hate pnr romance in general, particularly because of the 'dark, dangerous bad boy who wants to kill you' trope, and I think part of the reason that SHIVER is the only pnr romance I've ever liked is because Sam is a bit more sensitive, respectful, sweet etc - he doesn't patronise Grace with all this 'I have to protect you, you are a pathetic frail girl and I'm a big bad wolfie/vamp/angel' crap, he treats her as an equal. That's a good relationship. Plus, he wasn't a physically intimidating letch like Patch in HUSH HUSH, or a Guardian Of Her Super-Speshuuul Virginity like Eddy - Grace chose when she was ready and he was fine with that.
I admit the lyric and leaky womb thing is a bit weird, though! I suppose of the pnr romance groupie books, SHIVER fills a gap because it targets the girls who like their guys a bit more sensitive.
In reality, Edward would be a creep, Sam would be a wimp, and Patch would be locked up in a Juvinile Detention Centre for date-rape or sexual harrassment, but a lot of people seem to be happy to suspend disbelief a little bit for an addictive book and romance... :s