What Do YOU Think Qualifies as "Erotic Romance"?

I've been mulling something over lately because of a few comments and conversations I've seen and had. I read a review a couple of weeks ago that said something about that particular story being a "real" erotic romance which thrilled the reviewer because most of the erotic romance stories are "just" really hot sex.

I've also been challenged by my WRP editor to write a story that would qualify at "two roses" -- meaning it will include menage or bondage. Now, I'm more than cool with a good menage, and a little light bondage works for me, but mostly when I write (and read) erotic romance, I prefer one-on-one steamy sex.

I wonder -- do you, as a reader, feel somehow cheated if there isn't a little something *more* in your erotic romance? Do you think it's not really erotic if you don't have a little "tie me up, tie me down" or more than two bodies in bed?

And, what qualifies as "hot" when it comes to sex anyway? Does it need to be public, or does your heroine need to be a contortionist or should there be a touch of the voyeur? If they only do it in bed, in missionary position with one person, does it count?

What do YOU like in your erotic romance? What's the line where a spicy mainstream romance becomes erotic?

Inquiring minds want to know.