Say “killing”, not “murder”. Murder does not have a telos.
But here, let’s work on the point you made, which has some interest. Consider Bob, who makes a habit of taking machine guns and shooting them at people on the subway. In Bob’s universe, every time he does this, the bullets are miraculously averted somehow. This means that Bob never kills anyone.
Would it be accurate to say that Bob is engaged in killing? No. Would it be accurate to say he doing the “type of thing” that (in this fictional universe) ends people’s lives? Again, no. In that universe, killing is not done with machine guns.
Now consider a married couple having sex, in the ordinary way. Are they engaged in procreating? You might say, “That depends on what happens, whether a child is born.” Fine. But now ask: “Are they doing the type of thing that procreates?” Yes! They certainly are. Moreover, the thing they are doing – the marital act – gets its nature from its natural result: childbearing.
Is there still a marital act without children resulting? Yes, so long as the action type is the type that would – under proper conditions – result in children. If children were born because people with different colored hair played footsie, then footsie would be the marital act.
You’ll notice, by the way, that there is no BIOLOGICAL result of the marital act other than children. Emotional unity is a nice possible result, but it does not occur in any lawlike, biological way. Children are what make sex sex.