But it's obviously from a part of the Bible that no one considers applicable to Christians, except that one commandment.
You say none of that part of the Bible (Lev 18:22) applies to us? You think the following thing are acceptable to Christians?
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6]"None of you shall approach any one near of kin to him to uncover nakedness. I am the LORD.
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7] You shall not uncover the nakedness of your father, which is the nakedness of your mother; she is your mother, you shall not uncover her nakedness.
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8] You shall not uncover the nakedness of your father's wife; it is your father's nakedness.
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9] You shall not uncover the nakedness of your sister, the daughter of your father or the daughter of your mother, whether born at home or born abroad.
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10] You shall not uncover the nakedness of your son's daughter or of your daughter's daughter, for their nakedness is your own nakedness.
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11] You shall not uncover the nakedness of your father's wife's daughter, begotten by your father, since she is your sister.
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12] You shall not uncover the nakedness of your father's sister; she is your father's near kinswoman.
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13] You shall not uncover the nakedness of your mother's sister, for she is your mother's near kinswoman.
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14] You shall not uncover the nakedness of your father's brother, that is, you shall not approach his wife; she is your aunt.
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15] You shall not uncover the nakedness of your daughter-in-law; she is your son's wife, you shall not uncover her nakedness.
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16] You shall not uncover the nakedness of your brother's wife; she is your brother's nakedness.
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17] You shall not uncover the nakedness of a woman and of her daughter, and you shall not take her son's daughter or her daughter's daughter to uncover her nakedness; they are your near kinswomen; it is wickedness.
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18] And you shall not take a woman as a rival wife to her sister, uncovering her nakedness while her sister is yet alive. Lev 18:6-18 RSV