AngelicMachinery wrote...
Relationships are decided by much more than sex though, perhaps it's my bisexuality showing... but a persons personality tends to come more into play than simply what they have between their legs. Really, I would finger even when it comes to straights and gays gender while it is a defining aspect of whom you choose it is far more important that the personalities mesh over the plumbing. Ego, I would figure that personality aspects would be far more important when it came to ME relationships... but most characters can be romanced by Paragons and Renegades which boggles my mind.
Yes, relationships are built on more than sex, but sexual attraction is just as important as personality when it comes to fully-realized, consummate love. The statement "it is far more important that the personalities mesh over the plumbing" just isn't true. Though I don't claim to be an expert on the issue, we can look at the
Triangular Theory of Love:

A fully-realized relationship needs attachment, commitment, and sexual attraction. If any of these are missing, the relationship cannot be whole, so it is unfair to say that sexual attraction is less important than any other element of a relationship.
A
Mass Effect example of this, for me, is Garrus. He has the correct "plumbing" that I would generally require (that is, he is male) and I feel attachment and commitment to his personality, his character. I am not, however, physically attracted to him. I am not sexual attarcted to his Turian biology. Could I (by the way of Shepard) enter a relationship with him based on mutual commitment and attachment? Absolutely. But our inability to click sexually would be our downfall. So yes, sexual attraction is important.
However! I do think that I agree with your argument at it's core: the love-interests' infatuation with Shepard despite his/her actions, despite his/her conflicting personality, is confusing and, at times, jarring. Like sexual attraction, personalities must click for the relationship to flourish.
Personality is an extremely important part of any romantic relationship, but it is no more or less important than sexual attraction.