No. Calling masturbation “murder” depends on treating sperm as if it were already a human being or as if it had an inherent capacity to become one on its own. That framing confuses possibility with nature.
A thing can only develop according to what it already is, unless something changes what it is. A kitten will naturally grow into a cat if left alone, because becoming a cat follows from its nature. It will not become something fundamentally different—like a flying “super cat”—unless an outside intervention changes what it is. Possibility flows from nature, not from imagination.
Sperm does not have the inherent capacity to become a human being. Left on its own, it will never develop into anything beyond a sperm cell. Its nature is that of a part of a larger organism, not a whole organism in itself. When sperm meets an egg and fertilization is complete, a decisive change occurs: what existed as separate gametes ceases to exist, and a new entity comes into being—a single organism known as a diploid cell, or zygote.
That change in what it is is what matters. Fertilization marks the transition from cells with no independent developmental trajectory to a new organism with its own internal organization and capacity to develop as the kind of being it already is. Because masturbation involves no such organism, no human being is killed, and the act cannot coherently be described as murder.
Key Takeaways
Potential depends on what something is, not on what might happen if its nature were changed.
Sperm is a part of a human body, not a human organism, and cannot develop into one on its own.
Fertilization is the biological event that creates a new human organism with its own developmental trajectory.
Abortion involves killing a human organism; masturbation does not, because no human organism exists.