Yeah, self experience is hardly ever a good measure for a general statement.
From my own expirience i also find many statements i read funny.
If i take my own friends and close acquaintances...i know 2 couples which are lesbian, 1 which is gay, 1 which is in a poly relationship, one which is a brother/sister couple which have have 2 kids with each other, another which are cousins and have 4 kids...back in my teens i knew 4 which had had their first time with family members (3 cousins one with her brother).
My best friend is a woman and we are close for the better part of my life, so i was a participant in more girl talks than i ever wished for...they were pretty much all ok with a kiss here or there, even making out if drunk and partying, but none were bi curious.
From some learned a lot of excuses they used when they were cheating on their bf's, couple that with my experience i had in a gyn for half a year back in my trainee years as a nurse....i learned you should always make a paternity test for your kid (even if you don't especialy doubt your partner)....
I also mad the acquaintances of three stalker which were after my best friend, funny times.
The only one i ever knew which was bi curious was an ex of me nearly 20 years ago, convinced me to be open to new experiences...good times, bad times and her realization that it was not the best idea to bring her straight little sister in the relationship,which had a crush on her bf, to explore her curiosity...
I wouldn't say that incest is the norm thought, or that most women try to sell a other man's kid as yours, or that blonde women all have stalkers.
Peace