[cburgas]

His comment was specifically aimed at martial arts and I think could be extended to any contact sport. The on average smaller stature, different bone structure etc are giant disadvantages and would most likely lead to a higher potential of harm and damages.

I think nobody cares if differently gendered people run a race, you would see who is the fastest and people can draw their own conclusions if that is fair or not. I think this is very different if people start punching or run into each other at full speed.