20...? That is excessive, I think. How is the tolerance and obedience regarding that law - does anyone know for sure...?
After all, it is just a human need.
In Germany, sex is allowed when you are 14, with a partner age 14 or 15 .
When you are 16, you are allowed to have sex with a partner of age 16, 17, 18 or older.
When you are 18 or older, you may have consensual sex with a 16 or 17 year old, but not with a 14 or 15 year old, or even younger ones.
The law knows restriction for sexual practices only with regard to animal protection laws (!

). Means: sex with animals is a no go over here. status of relationship (married, unmmarried) as well as form of consensual pratices are not adressed by laws. Abuse of children (age limits 14 and 16 as described above), non-consensual sex and non-consensual practices obviously are forbidden.