Unzucht

Etymology
From, from ,. originally means “discipline, education, manners”. is derived thence, but was often restricted to the sexual sense already in early modern German. The  only later developed the additional sense “breeding”, with which  is now secondarily associated (“undue breeding”, as it were).

Noun

 * 1)  fornication; adultery; lewdness; promiscuity any sexual behaviour considered immoral or forbidden