Erotica Writing Groups

I recently stumbled upon the Erotica Authors Guild, thought I'm not a member and can't vouch for them as an organization. They are active on Facebook and Twitter.

I've been a member of the Erotica Readers and Writers association for several years. They're a welcoming organization with several published and many beginning writers. I owe my modest accomplishments to the help of its members.

http://erotica-readers.com/ERA/index.htm

It's run as an email list for security reasons. Send them an email with a request to join the three separate email lists.
Storytime - for new work and critique
Writers - for writing related topics
Parlor - for miscellaneous conversations