In Uganda, there’s a tribe called “Banyakole or Ankole”. This tribe has a different culture in Africa. If a man marries their daughter, you must have sex first with the Elder girl before the girl is officially given to you. This is done to enable the parents and relatives of the girl that the man is romantic and performs well on bed.
Normally, the action takes place in public or private. The sister will give consent then they are allowed to sleep and have sex. If a man does intercourse for more than 15 minutes without a break,he is considered a hero.
The man only does sex with the elder sister once in his lifetime. Once the act is over,they go separate ways. After approval, he will then be allowed to marry the younger sister.