I'm wondering here, when talking about homosexuality are we talking about the love aspect or the sexual intercourse? Is one side more natural than the other or are they treated the same? For the religious among us, the bible only condemns the sexual intercourse as far as I'm aware, but says nothing about loving. So, technically speaking, as long as you only had sex with the opposite gender, you could love whomever you liked.
I would argue that homosexual intercourse is more natural than homosexual love because there appear to be more cases in animals of pure intercourse rather than love and affection.
Right, but I think it's generally agreed that animals don't love and have affection for each other in the way humans do, so it's not really the homosexuality bit that makes homosexual "love" less natural in animals.
Romantic love is intertwined with lust, and that's the context we're using here. You could say that the love between father and son and mother and daughter is a "homosexual" love, but nobody ever says that because "homosexual love" is understood to be homosexual romantic love.