This argument is only valid if homosexuality is a choice.They could choose a heterosexual life, but I think that in most cases this wouldnt be advisable. Rather they are called to be freed from the prison of all sexuality; to engage in an intense self-discipline that results in the unique and beautiful freedom of self-mastery.
My use of the word 'permanent' was merely meant to indicate the implications of public expressions of sexuality, which most homosexuals seem to insist on (read: gay marriage). Ofc, they are not so moored to their sin if they have wisely chosen to retain their dignity and never make such dark thoughts - which they would know them to be - public.
I dont see how anyone could view it as a choice, seeming the extreme pressures put on homosexuals. It is much easier being heterosexual than homosexual, so i dont see why anyone would choose to be homosexual, especially when it is considered a sin.
I do have a big problem with your definition of love.