Sex After exercise ?!

So I’ve gotten back into running lately - I used to enjoy it but got out the habit. And now I’m trying to lose weight too.

But the last few times after I’ve got home from a run, I’ve been on my way to the shower and my boyfriend has been like “let me help you get undressed” and we’ve had sex first.

Now I just don’t get what turns him on, about me coming home all red faced and sweaty 😂