So much so that the occasional times I switch the script, the ATFs comment about it.

with a girl, I will flip the script from what we did last time.  I will continue to change things up every time I see her so she will not know what's coming and will remain alert, attentive and engaged even as we become old friends over time.  I do the same thing with Civvie girls.  Even on the first session with a new girl, I will not fall into the trap of letting her take the lead.  There is not much you can do to change the preliminaries very much, but once out of the shower, but I will patently refuse to comply with a request for me to lie face down.  Most girls are smart enough not to fight me on this, so from there on out, for however long that I see them, I will guide the action according to what I'm in the mood for, and no two successive sessions will ever be the same.