FHM System Requirements
 

An active Internet connection is preferred, as it is used to license the game; however, it is possible to play FHM with no Internet connection.

PC minimum:

Windows XP/Vista/7
1024x768 display
1GHz processor
512 MB RAM

PC recommended:

Windows 7
AMD or Intel Dual Core 2GHz
1GB RAM
1024x768 32Bit display
1GB HD Space
MS compatible mouse & Keyboard

Future Mac requirements TBA.

Could we get the Mac requirements? Please and thanks

It is working on my Mid 2009 MacBook Pro with 8Gb of RAM and a 2.53 core 2 duo processor. I am sure it is slow compared to newer systems but I don't know any better :).

That machine isn't too slow at all, it can still do solid work at that machine.

I've got a very very first Generation of the MacBook Air 1.6 GHz 2GB RAM and can still load this game but heavy.

So I guess to run this game on a Mac and compared to the min. Windows specs you'll need at least a Core To Duo processor of course ( better known as an Intel Mac ) 2.0+ GHz processor speed and 2GB RAM.
That's almost any iMac or MacBook from Late 2006 or Mid 2007 or younger.