Fornication is the "illicit sexual intercourse of unmarried persons," which is also adultery.

"Fornication is a common and crying sin.

Fornication and Adultery are modest Words: because they express an Evil Action as criminal, and so as to excite Horrour and Aversion: Whereas Words representing the Pleasure rather than the Sin, are for this Reason indecent and dishonest.

Such fornications are the violent excesses whereby conjugial sports are changed into tragic scenes: for immoderate and inordinate fornications are like burning flames which, arising out of ultimates, consume the body, parch the fibres, defile the blood, and vitiate the rational principles of the mind; for they burst forth like a fire from the foundation into the house, which consumes the whole.

Fornication is lust, but not the lust of adultery.

THE LOVE OF THE SEX, FROM WHICH FORNICATION IS DERIVED, COMMENCES WHEN A YOUTH BEGINS TO THINK AND ACT FROM HIS OWN UNDERSTANDING, AND HIS VOICE TO BE MASCULINE.