I run a few, and some of them you can buy partner accounts for on www.gaypartnerpasses.com

A list of some of the biggest ones are located at www.outster.com, and ranks.sextracker.com and click on the gay category from the pull down menu.

Off the top of my head, some of the biggest are:

gaybeef.com
greengay.com
hotgaylist.com
welovecock.com
cand.com
gaymoviedome.com
edengay.com
gaymovielist.com
lovethecock.com
shockinggaysites.com
male-movies.com