Came home from the store and found my daughter (14 ) kissing her sister (12) both nude in the living room. Our son (13) & the 12 year old were rubbing first daughters breast and clit . We have an open family where nude is OK. but this has gone too far I think. Without losing it I ask what did they think they were doing. Answer was trying to see what it felt like to be touch and played with by someone else . Then they said you did it when you were 12/13 . We only wanted to know what it was like. Now I am at lose for words. Should I punish them are have a long family talk with them and their Dad.