For traditional Christians, the Fall changed the game on all levels and so we live in a natural world (as opposed to a paradisaical world). The natural world was not created for our comfort or glory and so it filled with phenomena that is hurtful, destructive, and sometimes confusing (as well as joyful, nourishing, and edifying).
In an ignorant sense, God "made" everything including fuzzy bunnies and herpes simplex. In traditional Christian terms, bunnies are good and herpes simplex is awful. Similarly, celibacy, chastity and/or monogamy are good and adultery, promiscuity, and sexual addiction are awful. Homosexuality is simply another sexual sin. ;)