the husband should give to his wife her conjugal rights, and likewise the wife to her husband. For the wife does not have authority over her own body, but the husband does. Likewise the husband does not have authority over his own body, but the wife does. (1 Corinthians 7:3–4 ESV) As to how that can be interpreted as chastity I have no clue. There is a difference between sex and fornication. I have never understood the sexual repression. I am not aware of the bible putting any restrictions between a husband and wife.