My parents feel free to sex in front their chidren
We are totally five members me and my two brothers.iam 19 yrs old. My two brothers are 17 and 16.we are feel free to be naked in house my mom wears only bra and panty in house.but we(children)are totally naked. One night when dinner completes then we are all are naked we start to watch TV suddenly my father changed the mood and my parents done sex in front of all.this is the first time.Is it normal