Sumary:

Homosexuality: homosexual unwanted attraction? not a sin! It can be healed!

Homosexivity: homosexual self-consented desire, arousal or sexual activity? a mortal sin!

Homosexuality:

implies homosexual attraction, “homo” meaning “same” sex, thus including lesbians.

Attraction by itself, is NOT a sin: a married heterosexual man could find other women attractive without sinning, the problem is when he indulges in sexual desires, thus committing a mortal mental sin. Sinful thoughts are easily identified by arousal, but the sin comes even before that in the heart:

Mt 5

27 “You have heard that it was said, ‘You shall not commit adultery.’

28 But I say to you, everyone who looks at a woman with lust has already committed adultery with her in his heart.

29 If your right eye causes you to sin, tear it out and throw it away.s It is better for you to lose one of your members than to have your whole body thrown into Gehenna.

30 And if your right hand causes you to sin, cut it off and throw it away. It is better for you to lose one of your members than to have your whole body go into Gehenna.

https://bible.usccb.org/bible/matthew/5

The latter applies to self-masturbation, which could be regarded as an homosexual act, typically tied to pornography or sexual fantasies, all mortal sins leading to eternal hell, unless repenting before death. Mortal sins crucify Jesus, because, supra-temporally, He paid up to the last drop of His Blood for every single future sin.

Homosexuality is not a physical disease: there’s no homosexual gene. Though some men are more effeminate, fragile, artistic, sentimentally sensible and/or lack testosterone and virile virtues, that doesn’t cause homosexuality.

Homosexuality is a disordered attraction due to a Gender Identity Disorder, which could be treated, and many times, even cured, for example, in Catholic organizations like Courage, an approved ministry of the Catholic Church that counsels "men and women with same-sex attractions in living chaste lives in fellowship, truth and love":

https://couragerc.org

https://www.pathinfo.org/

https://www.youtube.com/watch?v=mKALVvfJo_E

Homosexuality can be cured and this proves it’s a disorder (a mental or spiritual ailment). Healing debunks the anti-scientific narrative of “gender ideology” and that’s why Amazon censors “conversion therapy” books because they are effective:

https://www.huffpost.com/entry/amazon-nicolosi-books-conversion-therapy_n_5d1f64a8e4b01b8347356c7a

There is no such thing as “sexual orientation”: except natural heterosexuality, sexual orientations are in fact sexual dis-orientations, deviations.

In most cases, it's not the fault of the person. Depending on the country, about 95% of homosexuals lacked a relationship with his father, and in males, a dominant mother. This percentage is diminishing:

The other 5% is perversion induced by a pervert (sometimes a childhood abuse), Comprehensive Sexuality Education ( http://stopCSE.org ), or by self-perversion. For example, another type of self-perversion is pedophilia.

Homosex:

sexual intercourse by two persons of the same sex, including any desire and activities leading to sexual arousal. Unlike homosexuality (homosexual attraction), any homosex is a mortal sin. Homosexivity could be defined as engagement in homosex.

It's a mortal sin, as any sexual activity outside marriage (defined as heterosexual, lifelong, opened to life), being "marriage", natural marriage among the non-baptized, and supernatural marriage (valid sacrament) among the baptized.

It's sad that those pointing fingers to homosex, are not realizing that by using contraception or doing typically homosexual practices with the opposite-sex, they are also incurring in sex as infertile as homosex.

Even within marriage, any sexual act deliberately or negligently not ending where it should naturally end, is a mortal sin:

Gn 38

6 Judah got a wife named Tamar for his firstborn, Er.

7 But Er, Judah’s firstborn, greatly offended the LORD; so the LORD took his life.

8 Then Judah said to Onan, “Have intercourse with your brother’s wife, in fulfillment of your duty as brother-in-law, and thus preserve your brother’s line.”

9 Onan, however, knew that the offspring would not be his; so whenever he had intercourse with his brother’s wife, he wasted his seed on the ground, to avoid giving offspring to his brother.

10 What he did greatly offended the LORD, and the LORD took his life too.

https://bible.usccb.org/bible/genesis/38

In fact, even naturally family planning without a grave reason is a grave sin.

Should we conclude that homosex is as grave as any other sexual sin, in or outside marriage?

Gen. 18

20 So the LORD said: The outcry against Sodom and Gomorrah is so great, and their sin so grave,

21 that I must go down to see whether or not their actions are as bad as the cry against them that comes to me. I mean to find out.

https://bible.usccb.org/bible/genesis/18

Like abortion, sodomy is one of the few sins that cries out to Heaven for vengeance. Sodom and Gomorrah were anihilated by God due to rampant homosex. Also, it’s clear that homosex abuse is worse than heterosexual abuse, even of virgins:

https://catholicnewslive.com/story/481405

https://web.archive.org/web/20140202170254/https://www.stpeterslist.com/11583/commentary-on-the-4-sins-that-cry-to-heaven-for-vengeance/

If you meet a homosexual:

1. Don’t judge. 95% is an injured child who needs spiritual and psychological healing.

2. Have mercy: love the sinner, hate the sin. If you don’t correct, you hate the sinner and love the sin. If you don’t apply fraternal correction, the sin falls on you. Homosexivity has a physical toll: males have a life expectancy 20 years below average. Loss of grace means disgrace. It’s not a lifestyle but a deathstyle.

3. Ask why he/she doesn’t have a good relationship to his/her father. When they are surprised that you know that, explain to them about the cures.

4. Offer to pray together, and the Word of God about homosex:

https://www.catholichawaii.org/media/224239/bible_verses_about_homosexuality.pdf

5. Then, the sipiritual healing of confession.

Let’s pray for the all of those in mortal sin, especially the dying:

Hail Mary, full of grace….