Personally i am not open with that kind of perception maybe because in the first place they are relatives and its in blood line . If ever that they are sexually attracted to each other i will advise my son or daughter to stop what ever they have . I may sound kuntrabida but it not right .
If close relatives (up to 3rd cousins), no. I will remind her na family pa din yun. If kamag-anak nalang (distant relative) like magpinsan ang lolo ng lolo ng lolo namin, I might reconsider.