A personal atmosphere is important to me. I like to spend the first half hour getting to know you better. There is no charge for this.
The total charge is for time spent and does not depend on what we do, so there are no "extras", but also no "discounts" if we do not have sex all the time. Of course it is possible that some of the talking was my fault, in which case I will not charge you for that time.
I only spend longer than 6 hours with people I have met before.
If during the meeting you or I find out that it is not what we have expected, you only pay for my traveling cost and the time we actually spent together – apart from the first half hour talking.