The bolded part is related to prostitution and the reason why it is high in India. Regarding relation with cousin and uncle it happens in west bengal and other part of India as being drunk they even do not have idea what they are doing and their mindset is clearly displayed in those story ... they did not spare mother, sister, mashi, pishi, house maid anything. Regarding Bangladesh we are muslim and respect our sisters, aunts and mothers. Not the case like India.
Lot like you of west bengal can only be obsessed with like Nasrin and Dipjol ... at best when Nasrin does not live in Bangladesh and Dipjol used to make movie targeting labor and rickshaw walas ... which I have never watched in my life. But no wonder it attracted you. Seems like you are also regular viewer of west bengali masala movies as well.