Here are some statistics that might be of interest--romance readership demographics.
http://www.rwa.org/cs/readership_stats
Slightly more than half are married or with a significant other. Mean age is well into the forties. So I would imagine few of these women, who probably are married, or have been married, or have had other serious love relationships by their forties--I doubt they are overlooking ordinary men in favor of Fabio-esque billionaires. That is a common view of romance readers, though.
I think they are looking for a few hours of indulging in an engaging, intriguing story. Like in other genres of fiction, romance readers are easily able to tell real life from fantasy.
Back to the OP and True Love/ Love at First Sight stuff. When I was young(college aged) I was always 'falling in love'.
When I was a college freshman I had a new boy friend I was pretty crazy about--he was very romance cover handsome. I can remember walking into the college library, he was at the card file, he looked up, saw me, smiled, and the sunlight hit his beautiful green eyes and they seemed to twinkle. My heart skipped a beat, not kidding!
I didn't marry him, we broke up, I tore up my diary and got drunk, all very college girl stuff. While he was very attracive, as time went by we liked completely different activities. He was going to be a lawyer. I was a drama major.
At my 21st B-day party, still in college, a guy I knew as a friend--I thought he was funny-- gave me a big old b-day kiss. A toe tingler. Skipped beats. Funny, he was really cute, I'd just never noticed. Insta love, we dated for a year then broke up. He was going to be a lawyer.
About ten years later I was at a wedding reception at a mountain lodge, and saw a guy friend I knew well in college across this big room(he is really tall.) He was laughing with a mutual friend and I knew--
That's the man I'm going to marry! My heart again skipped a beat. True story. But before we got married I had to get out of a relationship with a spoiled trust fund baby, not so romantic--trust fund baby never once made my heart skip a beat in fours years. I should have known. As soon as I was free, we dated a couple times, got engaged and married 6 months later.
The first time my father saw my mother, dressed in a yellow suit with gloves(it was the forties)--someday I'll blog their first meet, cute story-- he told his dad, "That's the girl I'm going to marry." Married 52 years.
My sister met her husband at age 15 and never looked at another guy. He was cruising Main street in a cool car, plus looked like Bon Jovi back in the day with the blond fluffy layers. They married at age 18. Sadly, he died a couple years ago, very suddenly. They had 32 years and were happy, full of plans.
I know all those were examples of attraction, but so many couples start there before sifting through the pros and cons as they get to know each other better. In romance novels the cons are more interesting than real life cons--like the green eyed boyfriend who turned out to be so dull, or my trust fund baby who needed a! lot! of attention and spent most of the winter on the ski slope(I don't like skiing.) Romance novel cons are the obstacles that get solved on the way to HEA.