Even though you're writing a novel, I would suggest picking up a short story anthology. When I started writing erotica, I found it easier to see the distinction between mainstream/literary-type erotica and written porn in the short story form, and you get a LOT more variety for your buck. (Because if you're writing a novel, you know all the plot/character/resolution mechanics, and those are the same in erotica - or at least they should be, IMO). The Mammoth anthologies are usually pretty good - they do one every year. You can also find some short stories for free online at sites like nerve.com, cleansheets.com.
If you really want to read a novel, I just finished 100 Strokes Before Bed, and I enjoyed it. I also enjoyed Anne Rice's Beauty trilogy, even though it has been subject to some (valid) criticism. If you want to read something that I thought WASN'T very good, there's Nadjima's The Almond. Seeing bad writing is just as helpful as seeing good writing sometimes, right?
And you know, if you're leaning toward romance anyway, there's no shame in picking up a Harlequin. A while back they were running a contest in their Blaze line and I read a few to see if the contest was something I wanted to enter. Category romance isn't my favorite thing, but I did like the two or three I read. They've also just launched a new erotica line called Spice, but I haven't read anything from that.
Good luck!