Apparently sleeping around will save humanity

The Metro ran a report today trying to tell us that sleeping with one partner will make the population 100% female. What bullshit.
To prevent this nonsense is to sleep around. Firstly, if all future babies will be female anyway, what's the point? And secondly, sleeping around is considered not good anyway due to STI's which we are all told to protect ourselves against. STI's are not a great thing to have and sleeping around will soon raise the risk of getting one and everyone will die out from them anyway. But if you want to believe this story then go ahead, but you've only got yourself to blame.