I sometimes have Runner's Highs that feels as strong as an org*sm - and they can last for 10-15 minutes - never meet a woman who could match that, so for me it would be an easy choice.
When this first started happening 20+ years ago I upped my running so much my GF at the time thought I was cheating on her. In a way I kinda felt like I did. Still an easy choice, obviously I'll never give up running.