Tinder Nugget O' the Day: A winky face doesn't make it Ok

I'm blue, he's white. I hope that is obvious.

There are about 8 million things wrong with this exchange, like he kept writing me after I stopped responding, and he lacked anything resembling a sense of humor, but perhaps the most perplexing part is his last text. What does that mean? Anal sex? Regular sex from behind? 

Can anyone clarify? Please leave a comment and don't forget the winky face.