I see all these responses for Mailchimp...
From the "Terms of Use" of Mailchimp:
"You will not publish any material that contains sexually related text, photographs or other content, or content that is defamatory, obscene, indecent, threatening, abusive or hateful."
http://mailchimp.com/legal/terms/
Why would you give ANY business to a mainstream company that clearly has a problem with "adult" rather than doing business with a fellow adult company?