It reminded me of a story that a heavyweight boxer once told me. His trainer was vehemently anti fighters having sex in the weeks before a fight. He said that rather than increase aggression it reduced it, and released too many feel-good hormones.
This boxer was something of a ladies man, and he had a new girlfriend. The ban was driving him and her crazy. His girlfriend made it her mission to break the ban. She tried everything, and one night, he cracked. Next day in the gym, he had to start his session with a few rounds on the pads with his trainer.
After no more than two punches, the trainer stopped him.
'You had sex last night, didn't you?' he said.
'Yeah,' the boxer fessed up. 'I did. How the hell did you know?'
'Felt the difference straight away,' the trainer said. 'Your legs are weak'.
So ended his pre-fight misadventures...