1 Corinthians 6:911
Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived: neither the sexually immoral, nor idolaters, nor adulterers, nor men who practice homosexuality, nor thieves, nor the greedy, nor drunkards, nor revilers, nor swindlers will inherit the kingdom of God. And such were some of you. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God. (ESV)
Lets see, umm... under a legal system Sexual Immorality is ambiguous, thus requires further study. So since we are faced with ambiguity, lets go to other passage, particularly those of the OT since they are more specific:
Leviticus 18 (New International Version)
Leviticus 18
New International Version (NIV)
Unlawful Sexual Relations
18 The Lord said to Moses, 2 Speak to the Israelites and say to them: I am the Lord your God. 3 You must not do as they do in Egypt, where you used to live, and you must not do as they do in the land of Canaan, where I am bringing you. Do not follow their practices. 4 You must obey my laws and be careful to follow my decrees. I am the Lord your God. 5 Keep my decrees and laws, for the person who obeys them will live by them. I am the Lord.
6 No one is to approach any close relative to have sexual relations. I am the Lord.
7 Do not dishonor your father by having sexual relations with your mother. She is your mother; do not have relations with her.
8 Do not have sexual relations with your fathers wife; that would dishonor your father.
9 Do not have sexual relations with your sister, either your fathers daughter or your mothers daughter, whether she was born in the same home or elsewhere.
10 Do not have sexual relations with your sons daughter or your daughters daughter; that would dishonor you.
11 Do not have sexual relations with the daughter of your fathers wife, born to your father; she is your sister.
12 Do not have sexual relations with your fathers sister; she is your fathers close relative.
13 Do not have sexual relations with your mothers sister, because she is your mothers close relative.
14 Do not dishonor your fathers brother by approaching his wife to have sexual relations; she is your aunt.
15 Do not have sexual relations with your daughter-in-law. She is your sons wife; do not have relations with her.
16 Do not have sexual relations with your brothers wife; that would dishonor your brother.
17 Do not have sexual relations with both a woman and her daughter. Do not have sexual relations with either her sons daughter or her daughters daughter; they are her close relatives. That is wickedness.
18 Do not take your wifes sister as a rival wife and have sexual relations with her while your wife is living.
19 Do not approach a woman to have sexual relations during the uncleanness of her monthly period.
20 Do not have sexual relations with your neighbors wife and defile yourself with her.
21 Do not give any of your children to be sacrificed to Molek, for you must not profane the name of your God. I am the Lord.
22 Do not have sexual relations with a man as one does with a woman; that is detestable.
23 Do not have sexual relations with an animal and defile yourself with it. A woman must not present herself to an animal to have sexual relations with it; that is a perversion.
24 Do not defile yourselves in any of these ways, because this is how the nations that I am going to drive out before you became defiled. 25 Even the land was defiled; so I punished it for its sin, and the land vomited out its inhabitants. 26 But you must keep my decrees and my laws. The native-born and the foreigners residing among you must not do any of these detestable things, 27 for all these things were done by the people who lived in the land before you, and the land became defiled. 28 And if you defile the land, it will vomit you out as it vomited out the nations that were before you.
29 Everyone who does any of these detestable thingssuch persons must be cut off from their people. 30 Keep my requirements and do not follow any of the detestable customs that were practiced before you came and do not defile yourselves with them. I am the Lord your God.
Leviticus 18
New King James Version (NKJV)
Laws of Sexual Morality
18 Then the Lord spoke to Moses, saying, 2 Speak to the children of Israel, and say to them: I am the Lord your God. 3 According to the doings of the land of Egypt, where you dwelt, you shall not do; and according to the doings of the land of Canaan, where I am bringing you, you shall not do; nor shall you walk in their ordinances. 4 You shall observe My judgments and keep My ordinances, to walk in them: I am the Lord your God. 5 You shall therefore keep My statutes and My judgments, which if a man does, he shall live by them: I am the Lord.
6 None of you shall approach anyone who is near of kin to him, to uncover his nakedness: I am the Lord. 7 The nakedness of your father or the nakedness of your mother you shall not uncover. She is your mother; you shall not uncover her nakedness. 8 The nakedness of your fathers wife you shall not uncover; it is your fathers nakedness. 9 The nakedness of your sister, the daughter of your father, or the daughter of your mother, whether born at home or elsewhere, their nakedness you shall not uncover. 10 The nakedness of your sons daughter or your daughters daughter, their nakedness you shall not uncover; for theirs is your own nakedness. 11 The nakedness of your fathers wifes daughter, begotten by your fathershe is your sisteryou shall not uncover her nakedness. 12 You shall not uncover the nakedness of your fathers sister; she is near of kin to your father. 13 You shall not uncover the nakedness of your mothers sister, for she is near of kin to your mother. 14 You shall not uncover the nakedness of your fathers brother. You shall not approach his wife; she is your aunt. 15 You shall not uncover the nakedness of your daughter-in-lawshe is your sons wifeyou shall not uncover her nakedness. 16 You shall not uncover the nakedness of your brothers wife; it is your brothers nakedness. 17 You shall not uncover the nakedness of a woman and her daughter, nor shall you take her sons daughter or her daughters daughter, to uncover her nakedness. They are near of kin to her. It is wickedness. 18 Nor shall you take a woman as a rival to her sister, to uncover her nakedness while the other is alive.
19 Also you shall not approach a woman to uncover her nakedness as long as she is in her customary impurity. 20 Moreover you shall not lie carnally with your neighbors wife, to defile yourself with her. 21 And you shall not let any of your descendants pass through the fire to Molech, nor shall you profane the name of your God: I am the Lord. 22 You shall not lie with a male as with a woman. It is an abomination. 23 Nor shall you mate with any animal, to defile yourself with it. Nor shall any woman stand before an animal to mate with it. It is perversion.
24 Do not defile yourselves with any of these things; for by all these the nations are defiled, which I am casting out before you. 25 For the land is defiled; therefore I visit the punishment of its iniquity upon it, and the land vomits out its inhabitants. 26 You shall therefore keep My statutes and My judgments, and shall not commit any of these abominations, either any of your own nation or any stranger who dwells among you 27 (for all these abominations the men of the land have done, who were before you, and thus the land is defiled), 28 lest the land vomit you out also when you defile it, as it vomited out the nations that were before you. 29 For whoever commits any of these abominations, the persons who commit them shall be cut off from among their people.
30 Therefore you shall keep My ordinance, so that you do not commit any of these abominable customs which were committed before you, and that you do not defile yourselves by them: I am the Lord your God.
I hope this helps clarify your misunderstanding. As for the OP, I hope she listens to the core advice and that is to seek a loving relationship that will honor God