Guys, who wouldn't you date?

If there are several choose the one who you'd be least likely to date. If you don't have a sister, then that answer doesn't apply.

Sister's friend
Friend's sister
Friend
Parent's friend
Parent's friend's daughter
2nd cousin (or more distant)
ex girlfriend's sister/friend
Select gender and age to cast your vote:
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For me, it would probably be a familial relationship that I wouldn't want to pursue. I would love to know them better, but not by dating one.
Guys, who wouldn't you date?
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