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From http://catholiceducation.org/articles/homosexuality/ho0082.html

The meaning of the word “natural.” Our nature is how God designed us, so what's "natural" for human beings isn't whatever you can find some animal doing; it's whatever fulfills our design. Men and women were plainly designed for each other — not men for men, nor women for women.

What harms whom. The idea that homosexual acts don't harm anybody isn't even close to being true; they harm those who commit them at every level, physical, emotional, and spiritual. To begin with the most obvious — the physical — how could it not harm a man to suffer rectal trauma because a large object has been repeatedly forced into an opening which was designed for a radically different function? Lesbian sex is no picnic either; the rate of syphilis among women who practice homosexual acts is nineteen times higher than the rate among women who don't.

Other levels of harm. At the emotional and spiritual levels, the damage of homosexual acts is less obvious but just as grave. Consider emotional harm. God designed the male-female pair to balance each other; by contrast, same-same mating drives the partners to extremes. Instead of balancing each other, they reinforce each other. If you want an example, think of the promiscuous tendencies of men in general. Unbalanced by women, these tendencies lead to the anonymous, no-brakes promiscuity of men who have sex with hundreds, even thousands, of other men. Now consider spiritual harm. In homosexual acts you're seeking union with someone who is only your own mirror image, so in a way, you're still trapped inside yourself. You haven't experienced the power of marital sex to take you beyond the Self; you're rejecting the challenge of union with someone who is really Other. In that way, homosexual acts are less like marital love than like masturbation with another body.