Why did he ask if he could kiss me?

It was the end of a very nice first date. We were sitting in his car, seeing if the rain would stop so I could go back home without getting soaked, when we realized it wasn't stopping anytime soon he opened his arms for a hug. So I hugged him and he kissed my cheek. Then he asked if he could kiss me.

Why did he ask? I'm not bothered by it or anything, in fact I thought it was really cute, but I've never been asked if it was okay to kiss me before. And from how the night was going, it wasn't super surprising that it ended with a kiss.
Why did he ask if he could kiss me?
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