Maybe I'm old-fashioned, but if I ever see the day when my girlfriend (or wife, or daughter) has to protect me from three punks, it's time to turn in my man card and just shrivel up and die.
That's part of why I like women who do martial arts, and preferably at dojos with a self defense focus rather than competition; it's a fair fight when we can divide up the opponents evenly among us for scorekeeping later. The third guy is a tiebreaker.
Besides, there are a lot of the younger ones in the jiujitsu class that remind me of my daughters, and from their fighting styles, I half expect to get a late night visit some day: "Hey, sorry to wake you, but my date wouldn't take no for an answer and I need some help dealing with him. Can you check to make sure he's tied up right in case he wakes up, and do you have a spare shovel?"
Had the ~13 year old daughter of an old friend numb my right leg Monday night because she couldn't get out of a side headlock. (I was being the extra-butthead uke and using knowledge of the technique she would normally use to make things a bit harder on her because she was being cocky. She tried a leg sweep, which didn't work because she didn't take my balance first, then managed to twist around in front of me, swing a leg up like she was going to do o soto gari, then plant her heel hard in the back of my knee instead. No points for failing to remember 3-4 other techniques for breaking that hold before her belt level, none for failing to get kuzushi before the takedown attempt, but serious bonus points for creativity, not giving up and effective problem solving under duress.)