Indenting the second line of a section title

Hi guys,

My question is the following:
By default, section titles appear in PDFs as follows:

1.2.5 This is a section title which is very
long.

I would like to indent the second line of a section title as follows:

1.2.5 This is a section title which is very
         long.

Is it possible? If yes, how do I modify the template?

Thank you in advance!!!
nancy