To ensure that they donot toggle between http and https, go to secure pages and let say you want to make a specific link 'mylink' secure. Write (use wild cards and a slash (*/) before and after your link) <pre>"*/mylink/*"</pre> in the list of secured pages to ensure that it is secured. I did it in multilingual site and it worked for me.

Posted this thing so that any one can take advantage of it. :)