I would have to say Hungry Mutt or Morphy I remember being around when ENF was coined.
80% sure it was HM.
Survey How old are you and where did you first hear of ENF
Get a point for each item !
1. Used a bulletin board pre AOL, Pre www (me very little on my commodore)
2. Used Aol , compuserve, prodigy (started searching for naked women immediately!)
3. downloaded from a USENET group alt.pictures.voyeurism

(first 'real' internet experience)
4. Found Nanpa listing Japanese vids on Usenet
5. Uploaded an image to a usenet group the hard way

(my first image was a woman getting her skirt blown up from a Nanpa vid)
6. Uploaded a video anywhere prior to 2000 (one of first was playboy mud wrestling hosted on my website, bandwidth gone!)
7. Visited 5i's Voyeur Board (desperate for any embarrassed nude females quickly learned not crazy about Voy stuff not like I imagined as a 1x2 year old)
8. Knew any of the CAM women from 5is (August? and 2 others I remember)
9. Had a personal picture website prior to 1998 (Called it TVrerun from very start, hosted on local ISP)
10. Remember swoppix (I barely remember this!)
11. Remember Egroups (Prior to Yahoo buying them)
12. Visited Byron's Stripping naked board (Prob where ENF was born quickly was overwhelmed with people like us and trolls)
13. Visited Hungry Mutts board
14. Remember when OCC open in 2004 (nerdvana)