"Sexual immorality" refers to engaging in sexual activities that are considered morally wrong or socially unacceptable, such as adultery, promiscuity, or engaging in sexual acts without consent. Full definition
While the Bible doesn't give us any clues on how we should date, Ephesians 5:3 does say that there be «not even a hint of sexual immorality among you». (uk.match.com)
The issue of Homosexuality and Fornication are for both testaments because as Paul said 1 Corinthians 6:8 - 9 Flee from sexual immorality. (nakedpastor.com)
He got involved in sexual immorality with his maidservant Hagar. (redeeminggod.com)