Why get a sexual relationship because of this? I am single forever.

If you leave me single you will have to stop me from killing you and because of that one or more us will die and I don't want anyone to be in sexual relationships and I don't think you can do it because you don't wanna die. I don't think anyone picked that. Keep the relationship but when we can live forever then we are not allowed to have sexual relationships if so some or one of us will die.