It is quite known practise that in old Eastern Germany female athletics intentionally get pregnant before event. Swimmers, runners, weight lifters ( I don't think acrobats and boxers
)
Semen is natural potent stimulant ( you could read it doping) , who knows how legal or not it should be....
To be absolutely in clear whole sex should be banned as no doubt external steroids enhance performance.
In such case only protected sex should be allowed amongst this athletics
If revealed one day that Lance Armstrong was a guy on top of doping scandal, that means double cheater
