I joined about 3 weeks ago and paid $15, I assumed it wasn’t optional. It seems there are other membership types that were free that don’t have the capability of private messages.
I too have a membership, I don’t believe you are allowed to message/receive without one, however you do seen to be able to put other contact methods in your profile (kik, twitter, etc.)
Asexualitic.com is the first community and dating site for Asexual people. When major dating sites don't recognize our asexuality, we think that asexual people should have a place to meet and talk.
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