I remember during a summer gasshuku in one year of many...... During a midday break for much needed sustenance, my wife came up to me from her kyu class as the Dan grades were doing something else.... she said, "That's it!! I'm never going to practise with another woman again" I naturally asked why, she replied, "ya can't put the techniques on this lot we've got here!!
How do you mean?, I asked.... she said "I just been told that I have to do an ukemi" (after someone tried to apply a kotegaeshi on her that didn't even tickle her) she just shrugged and flipped over for her.... Since that time she refused to work with women practitioners in fear she would probably damage them..... I cannot remember the last time she practised with a woman unless teaching a waza to a woman member of our club.... She didn't have to ask them to jump!!.....