The peak?

[tommy2]

I have been wondering at what point in your sexual relationship with a woman do you hit the "peak" of how good the sex is going to be? In other words, if I had to plot it out, in most of these relationships the sex is good, but not great the first time or two (as you get familiar with one another) and then gets substantially better around the 3rd or 4th time you have sex. It usually stays great from this point until some undetermined point in the future when it starts to plateau and then eventually stay at that level or get somewhat worse over time. I'm speaking mainly of intensity, how freaky they are willing to be, etc. not intimacy.

So, my question is: where is the peak period? I'd say its between time number 3 and time number 10. If at that point, for example, she isn't willing to do/try something you either aren't going to get it, or are going to have to go through a prolonged "convincing" period (e.g. anal).
Thoughts?