Young people need to be prepared for adulthood so that they are ready to use their genitals properly and safely. Madame shows them the technique of intercourse, teaches them how to suck and swallow and demonstrates by personal example how to get an orgasm. The young men really liked the lesson - they absorb all the knowledge with genuine interest. The adult woman seems quite happy with the result. I have no doubt they will repeat the lesson on their own!
He's lucky he didn't find his sister's hair on his razor. Such a beautiful sister could be taught a lesson and taught a lesson. Looks like she'll be leaving him hair more often now.