Newbie - FAQ
I mean, unless they're in the wrong place or you have an unusual number or something. (Which, really, you should market because you know someone's gonna be into that.) Unless you have a nipple fetish, I can't imagine that they're *that* important to a man. I've never read a review that said, "They were pink when I expected brown. I had to leave."
What's under my knickers is for private viewing only. While I've had people lose their composure when my shirt came off, no one has ever had their, uh, smile droop. 
... You can milk anything that has nipples?"
{from "Meet the Parents" - what a painful scene in a painful - but funny - movie}
Regarding nipple preferences, I can't say that I have ever met a nipple that I didn't like. Some are cute, some are beautiful, some are sexy, some are a little intimidating, but I have never met an ugly one ... uh ... pair, or a mean pair.
Even the word is fun to say. What's not to like?
Although, I do have to admit, if I was expecting pink, and they were kind of sickly green, I might just leave. Politely but quickly.