These are some of the resources that I've found throughout the internet thus far.
FetLife
Strictly straight muscular Caucasians with massively long and massively thick circumcised cocks
Circmoms: Proud mothers of circumcised sons
Circumcision Enthusiasts and Erotica
I Love Women Who Love Circumcised Men
Yahoo Groups
Many of these groups haven't been updated in years, are filled with spam, are most frequently updated with gay porn or circumfetish posts, but I'm including them in case they are of any help.
Information regarding circumcision. No erotica, but lots of science and tips if you need to find a doctor.More
Pretty much guys showing off pics of their dicks with a few stories here and there.
Mostly self-shot dick pics and polls. Appears nearly defunct except for spam.
Discussion only group
Appears to be spam only at this point.
Has some pics, a Margot Sullivan video, and some audio files of women being interviewed on their preference. Sadly, appears to have been abandoned.
Had some polls, but now appears to only be updated with gay porn spam.
Might be something here. Hard to sift through all of the gay porn. At least it's updated.
One of the more active discussion forums, though it's focused mostly on the eroticization of circumcision.
Fairly active discussion forum, but more political than erotic.
Fiction, mostly related to erotic experiences of circumcision.
All heterosexual forum for discussing circumcision.
Furry Circumcision!
Fairly active board regarding male and female circumcision of Furries.
Fairly
XAT
PlanetSuzy
List of Pornstar Preferences on Cut vs Uncut
A compilation of the preferences expressed by female pornstars in videos, interviews, and on Twitter.
ImageFap
This user has compiled tons of porn pics featuring women and cut cocks. While very little of it expresses any sort of preference on the part of the women, it's worth including for it's comprehensive collection of foreskin-less porn.
Tumblr
Similar to XposedGlans, these users compile porn images featuring women and circumcised cocks. A caveat is that many of these pages feature images of solo men or gay couples.