四分律行事鈔資持記 2.499

2.499

釋中，初緣。示境取知解者，以前淫觸，通於死活老幼睡覺；此戒必取解知言義，不解非犯，故特簡之。

In the explanation, regarding the first condition: pointing out the object and taking [her] understanding and comprehension is because the preceding lustful touch applied to the dead, the living, the old, the young, the sleeping, and the awake; whereas this precept strictly requires understanding the meaning of the words—if she does not understand, it is not an offense—hence it is specially distinguished.