Well, several things. For one, the first 10 chapters all deal with what you have to do to please the lord, specifically how and what to sacrifice to him. Yet modern Christians don't do that. Why not?

You say it's because sheep are cheap these days. But cows aren't. In any event, what changed that lets us ignore that part of Leviticus?

Similarly, the "trespass" offerings in Chapter 6.

In Chapter 11, the Lord commands you not to eat camel, rabbit, pig, shellfish, oysters, snails, turtles, and a whole range of birds. Most Christians now ignore this entire chapter.

Chapter 12: Women are unclean for up to 66 days after childbirth. Christians ignore this chapter.

Chapter 19: This chapter, like 18, is devoted to moral laws. Among them: No plowing a field with both oxen and horses, no wearing clothes made of both linen and wool, no planting two different crops in the same field. It also lays out specific rules for haircuts and outlaws tattoos and other body marks. Most Christians ignore this entire chapter.

Chapter 20: Adultery is punishable by death, as is homosexuality, bestiality, and marrying both a woman and her mother. Most Christians ignore this chapter.

Chapter 21: People with physical defects aren't allowed to make offerings to God. Entirely ignored these days.

Chapter 24: Swearing is punishable by death, plus the famous "eye for any eye" rule. Ignored these days.

Chapter 25: Every seventh year, let your fields lie fallow. Different rules for selling a house in a walled city vs. an unwalled village.... Both ignored these days.

In fact, almost all of Leviticus is readily ignored by Christians. Why, then, should we not similarly ignore your cite from Chapter 18?

I understand why you would believe your cite is relevant if you also follow all the other rules in Leviticus. Which is why I asked if you do.

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Man up.