While I agree with you ColtAR-15, I also believe that there's more to a man than his penis.
While, I'm sure that I will never have the biggest wang a girl has ever encountered, I can try to be the best man and lover she's encountered. When a woman decided to chose a mate, the penis isn't a major part. The sexual chemistry and their compatibility emotionally matter more.
in fact MUCH more.
However, you are correct in saying that physiologically, Penis Size matters in the sense that it can be a problem if it is Too Big or too small to function correctly. When I say function, i mean penetrate a vagina and ejaculate. If a penis can not penetrate a vagina it is not functionally able to perform its duties. which is first and foremost, procreation.
A penis isn't required in lesbian relationships... If they have decided that the use of a penis is required, they'll go for artificial ones. Yea, are they normally huge dildos? going by "popular strap-on" searches, absolutely not. they're in the functional range of 4.5-6" in insertable length and 4.25 to 5" in circumference. I've seen many a lesbian complain about "big" when mentioning something barely over 5" in girth and 6" in insertable length.
Penis Size matters STRICTLY in the importance of ability to be inserted and used to ejaculate inside. At least to my knowledge.
Size makes no difference when it comes to an elastic muscle... especially women who have control over their muscles.
The posts you mentioned where their "preferences" were I'm almost POSITIVE was the thread about what size would they chose if they THEMSELVES had the opportunity to BE men... not what they find pleasurable. I remember that clusterfuck of insecurity screwing up an otherwise good, fun thread, lol!