In any sexual relationship, there are three things I care about: 1. is there consent? 2. Are arrangements made concerning pregnancy? 3. Are diseases being transmitted? Once those three aspects are dealt with, I don't care what people do with their genitals. Each of the three aspects has potential complications (what is the proper age of consent? what happens if someone changes their mind? if a child is born, do the parents have the resources to raise it? etc).
Generally speaking, humans don't like to mate with people they grow up with. This makes sense biologically and discourages incest. For those that are still interested, there is a power dynamic in a family that could be a problem with consent. As has been noted, genetics suggest no children be born from an incestuous relationship, but that isn't an absolute thing.
So, I actually dated a woman that had met her (half) brother in adulthood and they had had a sexual interaction. She said the degree of attraction was very strong. The relationship with her brother had to end because there were threats to her keeping custody of her children (from another relationship). I had no issue with this aspect of her past. The three conditions above were met nicely.
Generally speaking, humans don't like to mate with people they grow up with. This makes sense biologically and discourages incest. For those that are still interested, there is a power dynamic in a family that could be a problem with consent. As has been noted, genetics suggest no children be born from an incestuous relationship, but that isn't an absolute thing.
So, I actually dated a woman that had met her (half) brother in adulthood and they had had a sexual interaction. She said the degree of attraction was very strong. The relationship with her brother had to end because there were threats to her keeping custody of her children (from another relationship). I had no issue with this aspect of her past. The three conditions above were met nicely.
