You are right to be cautious when a man starts communicating with you sexually. That means that is what he is thinking about. A man who is interested in a woman would be respectful and also cautious about coming across too sexual as he would not want to scare her away. Since you have already dated, he clearly feels comfortable in this arena, and from the sounds of it most likely all he wants is sex. If you communicate with him or not is up to you, but I think you are wise to use your gut feeling on this one.
As far as using kik, I don't even know what that is. I personally do not like using email, texting or any social media as a primary form of communication. If anything it would only be used to convey a specific message. Such as "running 5 min late." But it does feel that you are a like a bit dramatic as to the means of communication he chooses to communicate with you. But again, I don't know what kik is, I am just picking up on the energy about it. And it may be that you are not comfortable with his intentions and that is what is coming through.
Follow your gut. Always.