Leviticus 18:22
'You shall not lie with a male as one lies with a female; it is an abomination.
Lev 20:13
"'If a man has sexual relations with a man as one does with a woman, both of them have done what is detestable. They are to be put to death; their blood will be on their own heads.
Romans 1:27
Likewise, the men abandoned natural relations with women and burned with lust for one another. Men committed indecent acts with other men, and received in themselves the due penalty for their error.
These three are regarding sexual promiscuity with two of them specifically calling out people who have sex with both men and women, perhaps at the same time. All evidently outside of any marriage or commitment.
On the subject of abominations:
Unclean things (Lev. 7:21)
Customs of pagans (Lev. 18:30)
Idols (2 Chr. 15:8; 1 Pet. 4:3)
Sins of men (Ps. 14:1; 53:1)
Cheating (Mic. 6:10)
Lost souls (Rev. 21:8)
A proud look (Pro. 6:16-17)
A lying tongue (Pro. 6:17; 12:22)
Feet that are quick to sin (Pro. 6:18)
A false witness that speaks lies (Pro. 6:19)
A sower of discord (Pro. 6:19)
A false balance or scale (Pro. 11:1)
The proud of heart (Pro. 16:5)
Condemning the just (Pro. 17:15)
Divers, dishonest weights (Pro. 20:10, 23)
Refusing to hear the law (Pro. 28:9)
Prayers of the rebel (Pro. 28:9)
Eating flesh of peace offerings on the 3rd day (Lev. 7:18)
Taking ornaments from idols when being destroyed (Dt. 7:25-26)
Any Idolatrous practices (Dt. 12:31; 13:14; 17:4; 18:9; 20:18; 29:17)
Offering an imperfect animal to God as a sacrifice (Dt. 17:1)
Re-marriage of former companions (Dt. 24:1-4)
Cheating others (Dt. 25:13-16)
Making images/idols (Dt. 27:15)
Idols of Ammon (1 Ki. 11:5)
Idols of Moab (1 Ki. 11:7; 2 Ki. 11:13)
Idols of Zidon (2 Ki. 23:13)
Incense offered by hypocrites (Isa. 1:13)
Eating unclean things (Isa. 66:17)
Oppression of others, particularly the poor or vulnerable (Ezek. 18: 6-13)
Violence (Ezek. 18: 6-13)
Breaking vows (Ezek. 18: 6-13)
Lending with interest to a brother (Ezek. 18: 6-13)
Lying with a menstruous woman (Ezek. 18: 6-13)
Hardness of heart (Ezek. 18: 6-13)
Injustice (Ezek. 18: 6-13)
Things highly esteemed by man (Lk. 16:15)