Did you try to conceive a certain gender?
There is also a theory that boy sperm are faster but die sooner.. and girl sperm is the slow and steady type. So if you are looking for a girl try the baby dance a day or so before the big O so the girl sperm is already sitting there waiting.

HW:260+ SW: 248 Pre-Preg 180 Post-Preg Starting Wt: 225 Current PP wt: 195 GW: 170ish.