Or to rephrase that...
Less than half the women that have one-night-stands actually regret them. The huge majority of them have no problems with them.
Or at least, if you read what the articles say
And yeah, perhaps it does have something to do with conditioning. As young girls we are taught to be all about love and romance. We show our emotions easier as it is more allowed for us to do so growing up. So for some women to emotionally attach when it comes to sex isn't exactly a surprise, but I don't think it's because of why you seem to think it is.
I also struggle with the leap from pre-marital sex to one night stands. The two don't equate.