Don't be mad. I haven't snogged Demelza. That was her sister, and she -

She's honestly not worth mentioning.

The blokes who do tend to talk about that sort of thing are like Blaise, or Gamp. They want it known that they can make a girl weak in the knees. Harry's pretty much the opposite of that, and so am I, except in situations where such banter is called for.