I'm going to reply anyways (though I was on TBDL.org for a brief time years back) I'd gather its because its a fairly well run community and as the population increases and the word gets out more girls will move to the 'safe' environment.
Just my opinion anyways, it could just be random chance too
Well I was active for a while back on TBDL (Actually made it to VIP if I'm not mistaken, then left, and only came back for a few weeks right before it closed) but I'm a LOT more active here. Guess I just like it better that I came here at the beginning and I was on the same level as everyone else, opposed to going to an already established site with all the old times with thousands of posts etc...
Definitely more girls and more overall diversity here, which is a good thing. Bad thing, perhaps: people's concern about rep. I post as I post. I'm not mister popular, but nor do I usually seem to offend folks here, which I am glad for.
There are definitely more girls on here than on TBDL, but I think its wonderful that we are getting more diverse, and are attracting more females than before. It was more male oriented on TBDL, and I think that most woman felt uncomfortable there because of that. But when this site started afresh, it put everyone on equal terms and as a result, woman started joining. I'm glad they did to, it makes the family presentation of the site more complete.