C
- Old Testament Law says that a man who has sex with an unmarried woman has to marry her. That would be unnecessary if having sex made them married.
- If that were the case, some teacher somewhere would be reminding people that they had to treat the people they had sex with as if they were wives.
- Tamar has sex with Judah because he won't consent to give her to his son in marriage. After they have sex, there is no thought that they are married. Judah relents and allows Tamar to marry his son.
- As pointed out elsewhere, fornication and adultery would both be non-existent events if the act of sex made you married.
- David has sex with Bathsheba, and then later marries her. Also unnecessary if the sex made them married.
Having sex "makes you one flesh", and that is something that should be reserved for marriage.
As for Mark 10: "a man shall...be joined to his wife, and the two shall become one flesh". That's two things that should happen, not one.
Jesus does not seem to consider merely being with a man to make him your husband.
John 4:16-19 (DRA)
John 4:16-19 (DRA)
16 Jesus saith to her: Go, call thy husband, and come hither.
17 The woman answered, and said: I have no husband. Jesus said to her: Thou hast said well, I have no husband:
18 For thou hast had five husbands: and he whom thou now hast, is not thy husband. This thou hast said truly.
19 The woman saith to him: Sir, I perceive that thou art a prophet.
17 The woman answered, and said: I have no husband. Jesus said to her: Thou hast said well, I have no husband:
18 For thou hast had five husbands: and he whom thou now hast, is not thy husband. This thou hast said truly.
19 The woman saith to him: Sir, I perceive that thou art a prophet.
bible - Does the act of sex constitute marriage in God's eyes? - Christianity Stack Exchange