I'm anti-gay marriage (if you must have a black and white summation of my views), and I don't care what kind of romance EA puts in their games because if I don't like it it's my responsibility as a consumer/parent to avoid it. It could be interspecies furry tentacle alien cyborg romance for all I care. So this seems a bit silly. Not to mention sending threatening letters for just having the option of gay romances is kind of silly when you already have the option of murdering hundreds, stealing, lying, etc.
Same old "I don't want to take responsibility as a parent" crap.
Off topic: While I am don't feel like getting drawn in to a big long debate at this point, this kind of post makes me shiver. Let me preface by saying there are no issues in having an opinion of a matter and then keeping it oneself especially if it is hateful or infringes upon the freedom of others. That said, passing down prejudices and bigotry to children play a key role in holding back progression of the society as a whole and creating internal friction resulting in pain and suffering for either one or all parties involved. There is a difference between being gay, being neutral and objecting to something that will never affect your life but it will affect someone else's. And to an extent it sickens that there are so many LGBT phobic individuals who think legalizing gay marriage would all of a sudden turn others gay and that people who are LGBT are somehow "less" of human beings. Bigots and prejudiced individuals never really have a scientific basis for their argument. When in doubt most of them simply turn to their version of the archaic "good book" for answers or parrot what they have been told by their elders. Either that or as a defence mechanism spread irrational fear among people.
If one thinks long and hard, one will see that these rules/boundaries are placed for the sake of conformity and cleansing. Not really far removed from Nazism.
I am privileged to live in Canada where at least the law doesn't allow these bigotries or prejudices. My country isn't perfect either (no country is) but at least we are going the right way pertaining to the rights of LGBT.
It is our duty as parents to teach our kids what is right and wrong. But if the evolution of society has taught us anything, it is that the wrongs which pertain to subjugation or oppression of certain groups who are different from perceived majority is some way shape, form or function, are slowly but surely removed. I've always maintained that parenting is both good and a necessary evil for they/he/she will teach you about the wonderful things from their/his/her perspective/s but also either knowingly or unknowingly pass on their/his/her bigotry and prejudices. Good thing is kids are maturing faster than ever.
On topic:
Well one thing to remember is that games are becoming more complex than ever before and the exploration of "Taboo" topics are absolutely justified. Plus, this case seems to be user defined action and as such no is forcing anyone to do anything he/she may want to refrain from doing. So in the end, if you want your child to follow in your homophobic footsteps then tell them to stop playing the game.