So this is something that me and my friends been using pretty much all the time and it almost always get a positive response (like 95% of the time).

Basically you're chatting with a girl on tinder or whatever dating app and you ask for her IG/WhatsApp.
And once she gives you the handle/number you text her: "I'll send you something dirty so you'll know it's me"(still on tinder)

And on IG you send a pic of a dirty puppy or something like that
Now the worse she responds to the text on tinder the better her reaction is going to be on the WA/IG.
Also as you can see from the screenshot I just picked a random pic from google, if you got you're own pup it works a 100 times better