I think the reason girls don't like BJJ is the same reason guys don't like Ballet. What do you expect? BJJ is not feminine and the girls that do BJJ are an exception to the rule. In reality, when you compare the amount of girls that do BJJ versus the amount of girls that play any other co-ed sport other than maybe softball and volleyball and I'd say we're extremely high. I'd imagine that the number of girls that do BJJ versus the number of girls that play basketball is very high in favor of the BJJ side. I'd also imagine that more girls do BJJ than "real" Muay Thai. By real I mean more than just simply kicking the pads and very light sparring. As far as BJJ versus TKD and the like, well the enrollment at BJJ schools is very low compared to them anyway (as far as I know). I believe the ratio its at right now is about as good as it'll get.