that will be due to the fact that there isnt many single bi fems on here, and the ones that are dont need to be looking for adverts or checking the lets meet up forum!!!
prob best to get to know them through chatting in the forum or chatroom first imo!
We met a very hot single girl last week( you know who you are,lol, if u ever look at this bit???????) by getting to know them first, and getting on well.
good luck, M and D xxx
also, some of us dont take to kindly to being seen as a "birthday treat" like some kind of gift or gadget........................we're people you know :P