Question Summary:
When does Hurmat ul Musharah take place?

Question Detail:

Does Hurmat Musaharat apply, when you feel lust by merely looking at someone? Or does it only take place by: 1) physical touching and 2) looking at the private parts with lust

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh. 
The laws of hurmah al-musaharah are intricate. A general or brief explanation may lead to misunderstanding. If you have a specific query on it, you may forward that to us for our consideration.
 
And Allah Ta’āla Knows Best
Arshad Ali
Student Darul Iftaa
Trinidad
Checked and Approved by,
Mufti Ebrahim Desai.
http://www.daruliftaa.net/