I couldn't say it any better than Rember Truluck in "The Six Passages Used to Condemn Homosexuals" :
Author's Note: Both of these verses refer not to homosexuals but to heterosexuals who took part in the baal fertility rituals in order to guarantee good crops and healthy flocks. No hint at sexual orientation or homosexuality is even implied. The word abomination in Leviticus was used for anything that was considered to be religiously unclean or associated with idol worship.
Because these two verses in Leviticus (18:22 and 20:13) have been used more than any other Bible texts to condemn and reject gay and lesbian people, the following material is given to help you think objectively about traditional abusive use of the Bible regarding homosexuals.
The use of Leviticus to condemn and reject homosexuals is obviously a hypocritical selective use of the Bible against gays and lesbians. Nobody today tries to keep the laws in Leviticus. Look at Leviticus 11:1-12, where all unclean animals are forbidden as food, including rabbits, pigs, and shellfish, such as oysters, shrimp, lobsters, crabs, clams, and others that are called an "abomination." Leviticus 20:25 demands that "you are to make a distinction between the clean and unclean animal and between the unclean and clean bird; and you shall not make yourself an abomination by animal or by bird or by anything that creeps on the ground, which I have separated for you as unclean." You can eat some insects like locusts (grasshoppers), but not others.
Leviticus 12:1-8 declares that a woman is unclean for 33 days after giving birth to a boy and for 66 days after giving birth to a girl and goes on to demand that certain animals must be offered as a burnt offering and a sin offering for cleansing. Nobody today who claims to be a Christian tries to keep these laws, and few people even know about them! Why do you think that most people don't know about them?
Read Leviticus 23 to see the detailed regulations concerning "complete rest" on the Sabbath day and demands of animal sacrifices to be carried out according to exact instructions. Leviticus 18:19 forbids a husband from having sex with his wife during her menstrual period. Leviticus 19:19 forbids mixed breeding of various kinds of cattle, sowing various kinds of seeds in your field or wearing "a garment made from two kinds of material mixed together." Leviticus 19:27 demands that "you shall not round off the side-growth of your heads, nor harm the edges of your beard." The next verse forbids "tattoo marks on yourself." Most people do not even know that these laws are in the Bible and are demanded equally with all the others.
Why don't fundamentalists organize protests and picket seafood restaurants, oyster bars, church barbecue suppers, all grocery stores, barber shops, tattoo parlors, and stores that sell suits and dresses made of mixed wool, cotton, polyester, and other materials? All of these products and services are "abominations" in Leviticus. When have you heard a preacher condemn the demonic abomination of garments that are made of mixed fabrics?