That’s a problem with attitudes about sex and lack of impulse control during competition. The same could be said about doing your taxes before a tournament. It can take your focus, but it is not the taxes fault. It’s your lack of impulse control to keep your mind focused on the competition. Bad coaches ignore that there is a strong psychological component to training. But it has nothing to do with the sexual nature of the stimulus, just what you do with it and what is the attitude towards it.

Still, absolutely nothing to do with any physiological element of performance. Jerking one off the night before is not going to knock off anything, much less weight in your lifting personal record, for instance.