Duh I read it as if you wanted a girl but ya intercourse before ovulation gen3rally is said to give you a girl. So wait till the day of and maybe three days after ovulation. :)
because "female"sperms survive longer, so only they would be left to meet the ovary, but the "male" sperm runs faster, so it will reach the ovary first if it happens right at the ovulation.
If you have the money you can look into sperm spinning.
I believe only in one "theory", it's makes a little bit of a scientific sense. If you have sex and successful exactly on your ovulation day, it's gonna be a boy, if you had sex like a couple of days before your ovulation - it's a girl.
They say if you have sex 2-3 days before ovulation that it can help. This is due to the fact that female sperm swims faster and survives longer.
There is no way. His sperm either has an x or y you cannot genetically change that. It hust is what it is.