I spend a lot of time writing and thinking about sex so it's natural that I read about sex too. So while I do read a heck of a lot of romantica and erotica, I also read sex blogs. Sex blogs are (at least those I read anyway) can be intelligent and interesting and very informative. I don't care about the pornographic sex blogs, that's boring. I like the blogs written by intelligent people who have something to say about sex and sexuality.
I'm working out a BDSM storyline for a future book and so in addition to the research I've done books wise and about the lifestyle in general, I've also been reading a truly cool blog called Sweetness Follows. SF has journal entries from both the male (who is the dom) and his partner who is the sub. http://no-undies.net/
If you go to read, be respectful please, it's a great blog and they are wonderful people.
Another favorite is Mistress Matisse http://mistressmatisse.blogspot.com/
She's witty, smart and her blog is great reading and never fails to make me think or make me laugh, sometimes both.
Naked Loft Party http://www.nakedloftparty.com/
is sometimes about polyamory, sometimes about sex, sometimes aboutnothing. It's a good read
Oh and http://monmouth.blogspot.com/
Rentboy Diaries. I love him. Not only are his entries very very sexy but they are also witty.
There are more voices out there that inform and delight. I find new ones from time to time. Some take me way out of my comfort zone and I tend not to visit again but that's a good thing too. Others that I had grown to love have gone away - alas Belle Du Jour has ceased her blog and Red Whore is on hiatus.
The internet is an amazing place.