It's wrong to peep on others.
Hugh is dating Susan, and he is in her apartment while she is changing her clothes for their date.
Hugh wants to see Susan naked.
Hugh waits in the other room, then charms her on their date.
Hugh peeks in on Susan as she is getting undressed.
Susan invites Hugh to her apartment afterward, and they make love.
Susan is horrified and angrily kicks Hugh out of her apartment.