The unforgivable sins

What is the unforgivable sin? Blasphemy against the Holy Spirit is the unforgivable sin. There are in reality two unforgivable sins:

1. Blasphemy against the Holy Spirit. It is an eternal sin.
2. Unrepented sins are unforgivable, however,

Is sexual immorality a victimless sin?

Is sexual immorality among Christians a victimless sin? If unmarried Christians are cohabiting. If Christians are involved in homosexual activity or other acts of fornication, are these victimless sins?