Multiple domains to 1 site - Namecheap url forwarding

[tmax]

I have a business website.
For that website, I have about 5 extra domain names.
With namecheap account, I am using URL forwarding feature to forward all domains to one website.

So, when visitors type in MyExtraDomain(dot)com, it will go to MyBusiness(dot)com and the address bar will show my main business site URL.
It does NOT show 5 different domain names at the address bar.

Is that legal? (I mean, in the ethical SEO point of view).
Will I get banned from SE for doing this?

 

[obvio]

Yes, Google frowns upon this.

 

[tmax]

Oh I see.
Is there any way to forward my extra domain names to my current site without making google angry?

 

[AmD950]

I have tried to point 35 domains to the same site (those domains are with PR1 to PR3), and the site which is being pointed which raised from PR0 to PR2 in the last update.

If you go for PR, this might help for pointing multiple domains to a site.