How do you respond to a revealing snapchat?

So I hate using snapchat, but girls always want to snap me instead of texting me so i started using snapchat. One girl sent me a picture with a lot of cleavage, and another girl sent me a picture of her with her bra strap half off, so you could tell her bra was half off under her shirt. How should you respond to snapchats like these?
How do you respond to a revealing snapchat?
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