"Who can see my profile and posts?"
That's entirely up to you, and where on the site you post it.
A Quick Note on your Profile
Your profile cannot be seen by anyone not signed in - period. Even if someone had the link to your profile, the site would force them to be signed in before viewing it.
Controlling Post Visibility - Home Feed
When posting to the home feed, you're presented with a powerful modal that gives you a lot of options for kinky posting. At the bottom of the text field, there's a privacy dropdown. Your privacy options for a home post are:
- (1) Only Me ~ Posts you set to this option will only be seen by you.
- (2) Everyone ~ Posts set to Everyone can be seen by every member and ALSO the public - viewable to anyone who has the exact link to that post.
- (3) My Friends ~ Posts set to My Friends will only be seen by those you're friends with on MxM.
- (4) Anonymous ~ Posts you set to this option will be fully anonymous to other members - meaning they won't know who authored the post.
Controlling Post Visibility - Groups
Posts to Groups have onlyvisibility tiers - "All Members" and "Private". If the group privacy is "All Members", then your posts to it will be visible by any member.
Controlling Post Visibility - Pages
Like groups, posts to pages have onlyvisibility tiers - "Everyone" and "Liked My Page". If you choose "Everyone", your post will be visible to any site member. If you choose "Liked My Page", only those who have liked your page will see that post.