how can you fuck your own brother or sister?

Brothers and sisters are raised to look after each other, take care of each other, not to fuck each other, why do you think mothers and fathers are from different families.

plus if you have any kid with your brother or sister, likely chance that the kid may became disabled some way somehow.

>>18 your sick bitch find a man, billion man in the world

>>20 about other culture, alot cultures wouldn't except this kind of behaviour, the only culture i known that allows incest are muslim where cousins can marry cousins, and redneck where even brother and sister can fuck. this topic is sickens
y'all some sick twisted should be killed motherfuckers