This sugya continues to discuss various exemptions to the Yichud prohibition.  

This sugya discusses the “open door” exclusion – i.e. when there is a door that is open to the public

We begin by analyzing the reasons behind this leniency.  Is it because those inside can be seen by the public and they are therefore by definition not secluded?  Or does the knowledge that anyone can enter the area serve as a deterrent, therefore permitting the yichud?  The Poskim debate these two reasonings, with each having its own Halachic ramifications.

 Some scenarios that we discuss are:

• ·         When the door is closed but not locked
• ·         When the door is locked but others have the key/combination
• ·         When there is a closed-circuit TV/security cameras
• ·         Nighttime vs daytime
• ·         Doctor’s appointments