I think it really varies from person to person. For example the guy I am dating now has hooked up with a few of my other sisters but they never wanted a relationship together, whereas he does now with me. Weird I know, but it doesn't seem as strange when it's actually happening. I think it totally depends, if the girl had a nasty breakup with the guy or has some unresolved feelings for him it is your best best to stay away from her sister. It's just NOT a good idea. Guys on the other hand, they don't seem to care. I have dated more than 2 guys in Fiji and I am still friends with all of them and it was never weird. How that works, I have no idea.
