Just an anecdotal discussion to chime in on. Over the years my friends and I have had kids and a lot of the guys we associate with have too. I noticed an interesting trend amongst the guys who had done a lot of gear previously. They almost always had more daughters than sons (if any sons at all). Quite noticably so. I am certainly not a genetacist and there are no long term studies factoring into my observation but I always found it interesting and wondered what others thought. Does the Test early on and pre kiddies play a role I wonder?