He says that his mother got married at age of 16 and had him nine months later. When he was 15 his father died and his mother got married again with an older guy. On his 24th birthday party he got really drunk and told his mother he would like to fuck her. She didn't took him seriously but she started thinking about it. One year later on his 25th birthday, she got drunk too they actually did it. Since then she says he replaces his father, because he never wants to have sex.