[QUOTE=Selkie]
Hmmm… good question. Hamsters absolutely loathe me today, so I’ll keep it short.
[ul]
[li]Light on the discussion of the physical characteristics (both his and hers). Physical relationships between demi-gods bore me to tears.[/li][/ul]
[/quote]
Fair criticism.
[QUOTE=Selkie]
[ul]
[li]The brain is the sexiest organ, so lots of genuinely witty banter back and forth between the couple. They need not be beautiful, but they darned well better be articulate! … and smart, and educated (whether self or formal, I don’t care).[/li][/ul]
[/quote]
Pulling that off would require the author to be extraordinarily intelligent, witty and educated.
Please don’t hold the Harlequin stable to unreasonable standards. 
[QUOTE=Selkie]
[ul]
[li]Both parties somewhat unconventional and successful more on their own terms than society’s, but not fringe whack-a-loons either[/li][/ul]
[/quote]
Actually, that’s a fairly common romance-novel setup. (Even more common, however, is the plot where one lover is conventional and straitlaced and the other, more of a free spirit, teaches him/her to loosen up.)
[QUOTE=Selkie]
[ul]
[li]The romance builds slowly and gradually, rather than “I knew the instant we met”[/li][/ul]
[/quote]
OK, that’s gonna be a major sticking point. A romance novel is always the story of two and only two people – all the other characters are mere supporting cast – and who the lovers are is always clear from the first chapter. The romance might build slowly and gradually, but the mutual attraction (nowadays, usually in the form of basic lust) always has to be there from first sight.
[QUOTE=Selkie]
[ul]
[li]… and based largely on those little “I thought I was the only one who read this/did that/felt that way” moments where they recognize their mutual compatibility[/li][/ul]
[/quote]
Actually, that too is fairly common. (But it’s always lagniappe on top of the basic attraction the lovers feel from the start.)
[QUOTE=Selkie]
[ul]
[li]Neither party was actively seeking a partner, but found one out of circumstances and a gradually building admiration and appreciation of the other[/li][/ul]
[/quote]
That too. In romance novels, the lovers never find love when they’re looking for it. They did not meet in a singles bar or through an online match service, they were not set up by a mutual friend. Either they are childhood friends, or they are coworkers, or chance circumstances have thrown them together.
[QUOTE=Selkie]
[ul]
[li]Sex recognized as an important part of intimacy, but not the be-all, end-all of it[/li][/ul]
[/quote]
I thought you wanted something realistic! 
[QUOTE=Selkie]
[ul]
[li]Speaking of sex, I’m all for those “rip the other person’s clothes off” as the next woman, but sometimes it’s those little touches of a hand on the shoulder or a nuzzle on the neck that make one go weak in the knees. Lots of those little moments, please.[/li][/ul]
[/quote]
Seconded! 
[QUOTE=Selkie]
[ul]
[li]Let me stress again: equals. Both occupationally successful, both of at least roughly equal financial standing, education, etc. I don’t expect a point for point match, but “rich prince marries housemaid” stories make me grind my teeth.[/li][/ul]
[/quote]
That kind of story seems to be out of fashion anyway (at least in contemporary-setting romances).
[QUOTE=Selkie]
[ul]
[li]Absolutely no forced sex, babies, broken commitments to other people, giving up of virginity, prostitution, or rescues (financial, physical, or otherwise). Ever.[/li][/ul]
[/quote]
Except for the “rescues,” I’ve never encountered any of that in a romance novel.
[QUOTE=Selkie]
[ul]
[li]No weddings, or at least no wedding porn. Married couples can be just as romantic as unmarried couples, but I have a deep-seated loathing of traditional white frilly dress weddings and expect my protagonists to feel the same way. I’m also allergic to “Will he or won’t he pop the question” thoughts. If the story needs a gold band to prove they love each other and should be together, it has failed. [/li][/ul]
[/QUOTE]
And that’s gonna be the biggest sticking point of all. I repeat, a romance novel always ends with the lovers agreeing to marry – to end it any other way would be as unthinkable as ending a mystery novel without revealing whodunit. (The wedding is not always portrayed; the accepted proposal is resolution enough.) And the “will he or won’t he” speculation is indispensable – because there is no other way to weave any suspense at all into what the reader knows very well is a story with a foregone conclusion.