1 Cor 7
2 Nevertheless, to avoid fornication, let every man have his own wife, and let every woman have her own husband
There is a lot said on this topic but the bottem line it is best for one to be married!
If both are happy what is your problem?
I don't mean to nitpick, but the human writer of that passage, also wrote that it was his own personal opinion, that it is best to not be married, unless you can't help yourself (then he thought it best to be married). But certainly God intends people to be married (just read the account of Adam and Eve), yet I don't think after the genetic decay that has occurred everyone ought to be married....
From the Start Genesis man and women marry and procreate!
Not manatory but hightly reconmended!