Why are so many random people from India adding me on Facebook?

[Tanya]

Well, you've already covered part of it - they're creepy indian males!
There's a handful of reasons why they could be doing this. One is they're just creepy sexist pigs that want to find some random female to talk dirty with, (it says a lot that they have to prey on someone from another country. Obviously, the women of their own country won't touch them either, they're such disguisting, sex-crazed animals) or it could be possible that they're trying to start up a conversation so that they can eventually get around to asking you to pay for them to get into your country, or some such bullshit.
Either way, their intentions are not pure, and you should definitely ignore and block them.

You might want to change your picture to something that isn't a picture of you, as that tends to attract all the perverts, as they just search FB, trolling for pics of pretty girls to "try their luck" with.
I've had it before, and now I don't have a pic of me anywhere on my FB page (inc my profile pic), and the problems have stopped.

Best of luck...and don't add anyone that you don't know in real life, or from some other means (like from gaming, or forums or other chatgroups) that you have at least chatted to for a number of months.
Stay safe!