I've heard claims that there are differences between androsperm and gynosperm, that being sperm containing a Y chromosome and that containing an X chromosome. Specifically that the androsperm is faster, but weaker than gynosperm.
There also seem to be a number of companies which sell 'kits' which help you determine when is the best time to have sex in order to have a girl/boy based on this.
In two days worth of research, I've only managed to find an extract where it is claimed to be a hypothesis but no actual studies regarding this.
Does anybody have any idea whether there is any substance to this claim and, even better, does anybody have access to any peer-reviewed papers regarding the issue?
There also seem to be a number of companies which sell 'kits' which help you determine when is the best time to have sex in order to have a girl/boy based on this.
In two days worth of research, I've only managed to find an extract where it is claimed to be a hypothesis but no actual studies regarding this.
Does anybody have any idea whether there is any substance to this claim and, even better, does anybody have access to any peer-reviewed papers regarding the issue?