Is your game just to choose boy or girl and wait the result? 50% of victory?
If it's simple like this, I think it won't work... People want extra features on sites to start using it. You could at least add option "old" and "young". Each one choose a old boy, girl or young boy, girls. If the player predict the age or gender, he wins half profit.
You can have a look at our FAQs
The game has more power than 50% of victory.
In short: it is a big gamble platform with extremely public and fair and no-fake data.
The interesting hidden in this case , when the girl has 100 btc ,and the boy has only 0.001btc , and the boy win , the boy will win 100 btc.
www.girlbtc.com