If you were keen on the whole /r/Sissies link, then I might suggest that /r/Men_In_Panties is a subreddit worth taking a look at. There are 4,000 readers here and as a 4-year old community, it has a pretty liberal approach to moderation and basically lets the users decide what's decent.
Dudes in panties aren't for everyone, but if you like this kind of feminisation, you're going to have a field day. Note that a huge number of the posts here are of users on the site. This means that if you want to talk to guys that like to wear panties, you can do so with very little effort.
Men In Panties is actually quite active considering that there aren't too many subscribers and the niche is quite specific. You'll find that there are around 20 posts added on a weekly basis. It's not huge, but where else are you going to find this many amateur dudes willing to share their naughty panty pictures with you? Exactly.