knowing your girl as deeply and lovingly as you do creates that conundrum we all face as men...are we going to act 100% transparent? The short answer is definitely NOT! Women are biologically soooooo different from men and they're ruled far more by feel/emotion than we are. Divulging your PE activities (or any other 'personal' information) gets logged into their female brain to be categorized and utilized at a later date. As men we see things as 'problem/solution' equations, women don't...they have zero sense of 'quid pro quo' and only have honor toward their own benefit.** I know this sounds overly harsh, but that's the way they're wired...and I'm talking about ALL women, 100% of women, NO exceptions. If you know these things going in or if you're already 'in' you can save yourself a lot of head/heart ache by remaining true to your 'male self' and maintaining your own person. This she can understand and respect.
**this comes from a middle-aged man that has gone through 'the wringer' on several occasions thinking 'this girl is gong to be different' with me engaging in each relationship fully open/honest/loving.
What I type here is coming from a space of love and care...experiment w/it on a minimal level and you'll see what I'm talking about.
Best of luck!!