My gf does BJJ with me aswell. And while I am not worried about her getting a major turn-on from mounting/being mounted by the other guys in the gym, her being felt-up by guys at the gym while rolling or her leaving me for some other guy at the gym I have noticed that her being there does give me some problems.
I guess I will start off with some pro's though since this is supposed to be a response to a thread written by a positive guy
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*she works out
*she has a lot of fun drilling and chatting away
*she gets more understanding about my passion for the sport (no problem with buying epuipment equipment or me using a lot of money and free time to go to seminars etc)
*it is kinda cool watching ufc-events etc with your girlfriend
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*We have different degrees of seriousness while we are training: I am very focused on the drills et cetera while on the mat and often asked by my coach to help making sure that everyone in class gets the technique, help giving out pointers to those who does not etc. And she mainly does this to have fun with no real intention of advancing in the belts or competing.
This basically gives me two options: either she gets annoyed with me not chit-chatting with her while we're on the mat (even though I told her it'd be like this before she joined the gym) or me feeling stressed out about not being focused in class (horrible feeling of wasting mine and others' time)
*If during sparring she cannot execute a technique on me she gets very cranky, this gets even worse if I provide input on what she needs to change in order for the technique to work. If others point out what needs improvement there seems to be no annoyment, or atleast not to the same degree.
Sorry if I kinda steal your thread here, but it would be interesting to know how other guys in this situation deal with it? Maybe I can pick up some good advice

Also sorry about the grammar/spelling misstakes, english is not my first language and I usually lurk forums instead of writing.