Kamasutra 3.3.1

3.3.1

dhanahīnas tu guṇayukto 'pi, madhyasthaguṇo hīnāpadeśo vā, sadhano vā prātiveśyaḥ, mātṛpitṛbhrātṛṣu ca paratantraḥ, bālavṛttir ucitapraveśo vā kanyām alabhyatvān na varayet/

A poor man possessed of good qualities, a man born of a low family possessed of mediocre qualities, a neighbor possessed of wealth, and one under the control of his father, mother or brothers, should not marry without endeavoring to gain over a girl from her childhood to love and esteem him. Thus a boy separated from his parents, and living in the house of his uncle, should try to gain over the daughter of his uncle, or some other girl, even though she be previously betrothed to another. And this way of gaining over a girl, says Ghotakamukha, is unexceptionable, because Dharma can be accomplished by means of it, as well as by any other way of marriage.