The Concept of Fun Depends What the Brain Produces

I think sex is fun because my brain produces something wich runs me through on. 'm doing it because my brain has evolved throughout the evolution that is was good too, like a religeous partucal thing to make me do more ofspringitdo. But you aren't making your decisions based on thoughts about what evolution wants. My claim is more that pysic depemen in the brain give the its kind of similar lik a reward, and rain es e learning, right? So it's kind of thelike reward that trains the neral net thatis my brain. And in some sense, a volution, a as created this reward system, and my brain changes overtime