I think what he was saying is that a person can struggle with desires for un-God-ly affection for another person of the same gender. The Scriptures clearly differentiate between temptation and sin. YES, I do agree wholeheartedly that a person can most certainly sin with his thoughts and desires. However, my advice is to be careful that you don't become the hypocritical judge who fails to see the plank in his own eye. Examine yourself first--look to see where you fall short and are in need of God's grace, too.
The examination of our heart should begin and end with God's own word on the subject. I cannot trust myself enough to know except I find that guidance in the word of God. I have friends caught in this web of living and I pray for them every day with love and compassion. Truth out of balance is error.