I fear this won't be a fun as we think since it's possible officepark is the only member [I don't want to get infracted] to believe this.
He's not the only member. I agree with him and I'm sure there are a handful of others on here who do as well.
I stand corrected. Why do you think it's immoral?
EDIT AGAIN: Oh yeah, I'm going to feel kind of weird for passionately defending masturbation in a few posts. Okay, I'll roll with it.
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It's immoral because it is a sex act commited without the
teleos of procreation within the bonds of a sacramental marriage. It reduces a human person to a sex act, bypassing the relationship component of sexuality in its entirety. So, it's a sin against the virtue of chastity.
Here's a gospel passage that condemns indirectly:
It doesn't mention masturbation directly (ARAIK the only place the Bible does that is in the Old Testament), but I think believing masturbation is included in this condemnation is the best interpretation. And of course the Church teaches it to be illicit as well.
Most people on here will require a tangible harm to another person before they will consider something "immoral" so I doubt I'll convince anyone of a thing, but nevertheless that is the rationale.