It appears that you are using purpose and result somewhat synonomously. They are two different words with two different meanings. Much of your response indicates that since pleasure is a natural result, it is a purpose.
Not necessarily. In philosophy, the words “final cause” are synonymous with purpose. I would hope that we can all see the relation between cause and effect (result).
Purpose differs with respect to perspective. What was the purpose of Jesus’ death? If you ask God or Jesus, you will get one answer. If you ask the Jews who crucified Him, you will get another. Both perspectives are correct. The Jews DID put Jesus to death to silence Him. That was their purpose. God DID allow Jesus to die, so that we may gain salvation. Would the Jews agree that THEIR purpose was to participate in the salvation of mankind? No, it was not their purpose. Was it a result? Yes. To speak of purpose then, as an absolute, will confuse, since it is not. However, results are not subject to perspective. For this reason, the poll will confuse.
You are confusing objective reality with subjective reality. It’s like two people arguing whether something is 1 inch or 2.5 cm in length. There is only one objective truth, but both parties may be convinced they are right and the other is wrong. The example you gave above does not apply since God is the author of all reality and his subjective is our objective. So it really doesn’t matter what reason the Jews were putting Jesus to death since God knew what this would accomplish in his objectively true eternal plan of salvation. In other words, there was only one purpose or "final cause" for Jesus to die, that was for our salvation. The Jews, along with the Romans, were the “efficient cause” of Jesus’ death.
If you would have asked if pleasure is a natural result, even a good one, during sexual relations, I believe all reasonable respondents would reply in the affirmative. If you ask if pleasure should be THE motivation, most reasonable readers will say no. If you say can pleasure be a motivation, subject (inferior) to the real purposes of sexual relations, again, I believe that reasonable respondants would say yes. These are much clearer questions, that dispense with the confusion that make the poll less valuable.
In summary. It is semantics, and I believe more precise words should be chosen for such a poll.
I don’t think it is semantics, although I agree that I probably could have worded it better.
Dan