It was one of Paul's theological side effects when he wrote to the first century church, and his words are just as potent today.
Like all fallen creatures, men are not acting like they were originally designed to. Thus, we have the writings of Paul to the Corinthians in chapter 16:13. Men need to be constantly reminded to be men, because post fall our bent is to not operate as men. In the context of 1 Corinthians 16, Paul is specifically referencing men's actions in relationship to their faith in Christ and relationships within the body of Christ.
So it is today, that men need to "act like men", meaning be strong, and stand firm in the faith.
