His expression is slightly amused yet resigned. Like he has just heard some kids talking about sex. Every single generation thinks it invented premarital sex and the older we get the funnier the perception is.
I'm reminded by this card what is old is always new again in some form or other. We need to remember what we thought we were getting away with at 10, 15, and 20 before we summarily judge the generations following us as at worst a completely lost cause and at best hopeless, lazy, and lackluster.
Tarot opened previously closed doors to my own heart with it's merciless quest for the truth, nothing but the truth. They flay the soul and make me say thank you afterward. Each hour spent with my cards is a new lesson to be learned. Viva la Journey.