In order to view 18+ content, you must enter your usual login password once for each session in addition to the actual login.
This can be done in the profile management under "Unlock over-18 content". If you try to access adult content, a password input window will also appear to unlock the content.
We ask for your understanding that this additional security is necessary due to the possible use of auto-login.
You forgot your password because the login is stored in the browser? Then you can find help here.