Men Are From Mars

So today at work there was a discussion around dating and when activities are appropriate. This was a very men are from Mars, women are from Venus discussion. It was highly entertaining for me personally as I tried to remain as quiet as possible. To give you an idea without naming the guilty or innocent:

Person 1: Holding hands is a definately by the 4th date thing, but by the 4th date sex is ok too.
Person 2: Depends on how often you are seeing them as far as 4th date and sex being ok.

Person 3: What about kissing?
Person 1: Oh that is like a dozen date thing.
Person 2: Wait that is like a 3rd, 4th or 5th date thing.
Person 3 to Person 1: Your kissing them at 4 months and having sex with them on the 4th date - that's a hooker.
Person 1: Maybe that's what I am doing wrong...