Kamasutra 7.1.21

7.1.21

pāṇigrahaś ca saṃvatsaram avyabhicāryas tato yathā kāminī syāt/

When the daughter of a courtezan is thus given to a man, the ties of marriage should be observed for one year, and after that she may do what she likes. But even after the end of the year, when otherwise engaged, if she should be now and then invited by her first husband to come and see him, she should put aside her present gain, and go to him for the night.