The only difference I've noticed, as with most people here, is sparring. However, how the blokes spar the women seems (in my dojang, at least) to be almost entirely down to the way the woman spars, ie if she backs off a lot, complains when hit, etc. then they tend to go slower/lighter, and are less likely to call her over to spar. I tend to go for the "give as good as you get" option, don't complain when hit, get straight back up if knocked down and get in the next hit as fast as possible... and consequently the blokes call me over to spar with them as they do with each other and as far as I can tell, don't hold back or, if they do they certainly hold back a lot less than with some of the less confident (attitude rather than ability-wise) female sparrers. It's entirely down to your attitude and how you come across.