If "pair bond" is not true, then how is it that at the same time: there is an idea that virgins are clingy ; idea that it is better "not to have sex on the first date so as not to cloud your judgment with hormones"?

Usually when someone talks about "pair bond" they do not mean a biological concept like some invertebrates, mammals and birds. People are not voles or ducks and this is obvious, but what prevents you from considering "pair bond" as an extremely deep degree of attachment to someone?