There is only one important health rule that must be observed: A couple should never switch from anal intercourse to coitus without a thorough washing of the penis in between.

• 只存在一个必须遵守的重要健康常规： 一对性伴决不应该在没有彻底清洗阴茎的情况下，半途就从肛交转换到阴道性交。