Was King David a homosexual?

http://blog.beliefnet.com/godspolitics/2007/12/being-poor-is-a-lot-of-work-by.html
An online friend made the assertion in the title, and then said this as further justification
"Everything is permissible" and "Love is the fulfillment of the law." We each have to work out our own salvation by determining what our conscience tells us is the loving thing to do. If you still believe in law, then you are among the foolish Galatians.
Lack of compassion for the poor, the sick, the homeless, the undocumented, and the gay is all the same lack of compassion--trying to impose a dead legalism where the law of love should be the foundation for our actions.
I wrote:
The law is not the means of righteousness, but it is still the measure, for it is not subjective and arbitrary like your utterly sentimental appeal to what you call "love." Love is the FULFILLMENT of the law. If you love someone, you WILL see their need and meet it. Whatever you feel like, whatever your motivation or lack thereof.
If my motives are good, and I still ignore the poor, does that get me off the hook? Of course not. If I have withheld wages, I am stealing. Even if I really, truly think ten cents an hour is all I can afford. Who says I’m not sincere? You can’t know my motives, nor I yours. But you can see my actions and judge rightly. Jesus said we are to judge all people the same, i.e. according to revelation, not our personal, internal, inaccessible whims.
Your appeal to Galatians ? 14When I [Paul] saw that they were not acting in line with the truth of the gospel, I said to Peter in front of them all, "You are a Jew, yet you live like a Gentile and not like a Jew. How is it, then, that you force Gentiles to follow Jewish customs?
Peter was accommodating the Judiazers, who compelled circumcision and ritual observance of the law. These are the parts of the law which have been fulfilled. As for the rest—the shameless adultery and other breaking of the Ten Commandments you falsely accuse David, Jonathan, and Ruth and Naomi of—not one jot or tittle will pass away. You quote King Saul as your authority: here is exactly the one who does as he pleases, offering sacrifices from a sincere, well-intentioned impatience. Later he claims to "love" David, then tries to murder him. The Law judges King Saul, the Law judges me, the Law judges us all. Without throwing ourselves on Christ’s mercy we all are lost. The standard has ever, only been this: are we as perfect as Jesus? Are you? I know I’m not. I rely on his perfect fulfillment of every part of the law as my only salvation. My motives are nothing. My sentimental appeals to "love" and pity are nothing. Jesus, as revealed in the Scriptures, is everything, my righteousness, my holiness, my redemption.