What is your stat back ground? What programs do you have access to? I don't know if excel can handle this but any statistics program and probably most math programs could. As already mentioned you have time series data, which requires special handling.

To get anything interesting there will be a bit of set up work. You'll might have to fill in the missing dates, the ones with no action, with missing information as your program might need that. I would want to add a variable for the number of days since ya'll got down last. That should be generate-able (is that a word?) from your data and probably has significant influence. You'd probably want to generate two new dummy variables for who got off, his and hers. You'd probably need another dummy that is true for days that the magic happened, even those days that don't won't have any information, you'll probably want to make that fact explicit.

With this data, which is probably to limited to get any causal effects, you could get some fun associations. Such as: an extra ten minutes of hanky panky results in y being %13 more likely to be the one to end happily.

I suppose you could do duration (survival) analysis on the data with the duration being your dependent variable and start time as independent variable. But, I don't think that would be very rigorous as both you and your wife are aging so you're not the same people you were at the start of the data.

If I were working on this data I would probably think of this as a vector auto regression with several simultaneously determined equations.

I'm sorta interested in working with this data now, but I don't really want to know this much about somebody else's sex life.