I’m sure you realize that what you do to get that pleasure is mimicking the marital embrace…
From
chastity.com: “We can not justify a physical sin by mentally distracting ourselves from our actions. It’s like asking if it’s okay to shoplift a CD as long as you are thinking about feeding the homeless. Your mind may be doing one thing, but your actions say another. You could even compare it to the kiss of Judas. His body showed love to Christ, but his intentions were full of sin. When you masturbate while trying not to lust, it’s kind of like doing the reverse. You are supposedly doing something noble with your mind, and something disordered with the gift of your sexuality.”
Don’t forget that our bodies have been created in the image of God- male and female- so much so that God himself was willing to embody himself as Jesus. Our physical actions contain intrinsic meaning. Masturbating is like trying to shake hands with, hug, or kiss yourself. These physical actions are meant to be shared with other people. They are all God’s gift to us so that we can share love through our bodies. Willfully masturbating is so incredibly much more disordered than those other things mentioned, because the built-in purpose of the sex organs is to create life and bond the
two people who are creating that life in order to strengthen their relationship for raising the children.
Using our sexual organs with ourselves becomes the absolute antithesis of what the physical act is saying. The use of your own hands becomes the female, and the pleasure becomes its own end, rather than being there because the act reproduces the species and bonds the pair together.
Speaking of which, you are a big fan of using evolution to justify morality, so why don’t you accept that our bodies make sex pleasurable because it propagates the species? The orgasm is what gets us to make babies! It’s what nature intended, right?

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i’ll give you that last point, its true, but its not hindering me from procreating. also mimicking doesn’t have to mean mocking.
and no offense to you or your source, but you quoted a Catholic website. that would be like asking a car maker whether or not their car was good, of course they’ll say its good. and a dilema with beginning of that source you cited is that they start out by assuming it is sinful