Yeah. Every female who had brothers rolled with males from a very young age :P It's inevitable. So why not in the gym as well ?
Fighting is more or less a form of expressing yourself, and there is no place for stupid sex-linked prejudices in training. If a sparring session improves your performance, then it has no importance you gained that experience rolling with a man or a woman. An armbar will hurt the same regardless if it's applied by a men or a women. If you are ashamed a women got you, learn how not to end in the same position again :P In a word, learn to express yourself better .
And even if you are superior to the girl technically and physically (or to another opponent, regardless of sex), it doesn't mean that rolling is devoided of any value. It may be useful to you if you tame a bit your strength and fine tune your timing and technical execution of techniques, putting her in difficult potions in which she would not end with a partner of her value, forcing her to practice escapes, or various counters. It is very beneficial for the inferior rank to practice this way sometimes.
So basically your helped someone refine techniques escapes/counters which would be hard to practice otherwise in sparing with partners of same level, while deriving some benefit yourself.
But many ppl will not think that way. Ego is monumental in some of the combat athletes of both sexes. Some go all out, play to win in each and everyone of the sparring sessions they have. And is not good. If you can help someone from your team to progress without impairing your progress, then you should doit.
That being said sometimes is not so simple. Sometimes men and women will not feel very comfortable to roll together , especially in very "intimate" portions like a closed guard. Some go over it fast, others don't. Other times men will be afraid to roll with a women which has the potential to submit them because of the ego. Others will be afraid not to loose , but to be looked upon as jerks for manhandling her.
As somebody else in this thread said, there are ages in which girls will beat boys routinely. It may not be wise to pair them with girls at that stage, they may not understand why the girl is better at that age and quit coming to training from shame. This situation is not about ego.
But I am and I will be always against mixed sex in competition in any sport whatsoever, at any level and at any age whatsoever.
Hopefully she doesn't need an introduction for anyone:
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BJJ is really taking off in the USA... good to see it happen. My cousin (female) recently got into it, and she loves it. The difference here is that you're talking about sparring and grappling... there's no pinning or the need to inflict extreme pain; you tap. In my view, any woman who isn't fluent in self defense, who has the physical capacity, should engage in this.
One thing you mention that is important because it goes to the core of, "train how you fight", we agree on competiton, but for self defense... you NEED to be comfortable. Frankly, if some guy is trying to rape you, or otherwise assault you, it can't be the time to have qualms about what you have to do... including intimate contact. I know of no way to innoculate people against their instincts except through training, and training should always be as REAL as humanly possible.
Oh Krav Maga... you made my Kung Fu practical. :biggriN: