In the animal world, some male species fight each other to win the female by showing strength and dominance. This should be the process for winning human females too.
The government should issue these inflatable dicks to all males to carry around with them 24 /7. If two men in a pub or on the high street see an attractive female they both fancy, they whap out their inflatable dicks, blow them up, fasten them to their waists and then fight to the death. Whoever is left standing gets the girl.
We think Boris Johnson will definitely go for this idea for the benefit of human evolution if we pitched it to him.