Fetish1 - thanks for the plug
I'm the other owner of For The Girls. I feel I should say that our site is more specifically for women by themselves than for couples. Yes, we have a lot of couples content, but the site is really more aimed at women than couples using porn together. That's not to say that a man and woman surfing together wouldn't enjoy it, but the language/content/stories inside the site are targeted towards women.
As far as I know Couples Sex was the only site of its type, that offered the varied content that it did (women, men and couples pics) and which specifically stated that it was meant for couples to use together.
I also want to say that Susanna has made a great site and it's a real shame that circumstances have worked against her so much.
In terms of offering couples an alternative... the best you can do at the moment is offer something like Kara's, which is a well known megasite, or similar.