'Sexual Immorality' in the Bible

It has actually been reported [to me] that there is a case of sexual immorality among you that is unheard of, even among the [unconverted] Gentiles. One of you is having sex with his stepmother.

"Food is for the stomach, and the stomach is for food;" but God will destroy both of them. Yet the body is not intended for sexual immorality, but is intended for the Lord's [honor and service]; and the Lord is for the body's [benefit].

Stay away from [any involvement in] sexual immorality. Every sin a person commits is outside [the realm] of his body; but the one who commits sexual immorality sins against his own body. [Note: Possibly this means that sex, because it requires the deepest and most complete commitment of human involvement, becomes a unique sin when its true purpose and expression are violated].

But, because of so much sexual immorality, each man should have his own wife and each woman her own husband.

Neither should we commit sexual immorality as some of them did, [with] 23,000 people falling dead in one day. [Note: Num. 25:9 mentions 24,000 people slain, but that number could have included the additional people slain by the judges. See Num. 25:5].