I found most of her blog to be simple common sense.
I admire anyone's willingness to explore something they don't understand, but in this case, if you admit you don't understand homosexual sexuality, then why not get a section written by someone who does - a gay person.
I think her conclusion is flawed.
It is a stereotypical assumption made by a large number of heterosexuals, that homosexual relationships 'mirror' heterosexual ones.
In other words, there must be a 'man' figure and a 'woman' figure - because that fits with how heterosexuals work, and they lack the imagination to think that anyone other would operate differently.
I would suggest that homosexual relationships are far more layered, nuanced, and subtle than for one partner to 'assume' a gender role.
But of course, I am also speaking without experience - so I look forward to a more informed view, should one come along.