Scotty Wandell (Luke Macfarlane) and Kevin Walker (Matthew Rhys) have come a long way since they first met.  What started out as a professional relationship between a lawyer and a key witness has eventually budded into a romantic affair that has endured many storms.  In the most recent episode of Brothers & Sisters, the gay couple has decided to take the next big step in their relationship as Kevin proposed and Scotty said yes. Although homosexual relationships aren't prohibited on TV, only a number of shows have incorporated gay romantic scenes in their storylines.  And because of ...