Why is sex treated as Taboo topic in India ?

Even though i am 23M and have 26M brother , i still hesistate to put some Movies on Televison during dinner time or any other day when all of us are watching TV , I fear every now and then , that some kissing scenes / or romatic scene may appear and i feel embarassed or awkward tbh ( reason being i have the Remote and they look at me as if i made them do that sh*t ) , its hard to explain this feeling lol 🙏😭