I'm relatively new, so I'm wondering of this sounds familiar:

1. Seeing an A+ provider in the afternoon, then at night trying to mask your unbridled joy as you bounce around like a teenager who just got laid for the first time.  
2. Trying to move normally the next day as your entire body aches but you have to hide the pain from your SO lest you need to explain it. And, of course, she wants sex tonight.  

It's odd that sex with a provider causes muscle aches but not sex with the SO. I have a few theories on that, but I'd love to hear some others.